Hi. Starting my own thread here, as there seems to be a variety of others that are all different. Everything is setup, "works" in the sense that the login is accepted, but then the below error appears in the flarum.log
[2019-08-09 08:41:42] production.ERROR: TypeError: Argument 1 passed to Flarum\Forum\Auth\Registration::provideTrustedEmail() must be of the type string, null given, called in /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flarum/auth-twitter/src/TwitterAuthController.php on line 93 and defined in /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flarum/core/src/Forum/Auth/Registration.php:71
Stack trace:
#0 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flarum/auth-twitter/src/TwitterAuthController.php(93): Flarum\Forum\Auth\Registration->provideTrustedEmail(NULL)
#1 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flarum/core/src/Forum/Auth/ResponseFactory.php(42): Flarum\Auth\Twitter\TwitterAuthController->Flarum\Auth\Twitter\{closure}(Object(Flarum\Forum\Auth\Registration))
#2 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flarum/auth-twitter/src/TwitterAuthController.php(97): Flarum\Forum\Auth\ResponseFactory->make('twitter', '113450342548233...', Object(Closure))
#3 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flarum/core/src/Http/RouteHandlerFactory.php(40): Flarum\Auth\Twitter\TwitterAuthController->handle(Object(Zend\Diactoros\ServerRequest))
#4 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flarum/core/src/Http/Middleware/DispatchRoute.php(67): Flarum\Http\RouteHandlerFactory->Flarum\Http\{closure}(Object(Zend\Diactoros\ServerRequest), Array)
#5 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): Flarum\Http\Middleware\DispatchRoute->process(Object(Zend\Diactoros\ServerRequest), Object(Closure))
#6 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/reflar/stopforumspam/src/Middleware/RegisterMiddleware.php(75): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#7 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): Reflar\Stopforumspam\middleware\RegisterMiddleware->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#8 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/fof/ban-ips/src/Middleware/RegisterMiddleware.php(91): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#9 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): FoF\BanIPs\Middleware\RegisterMiddleware->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#10 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flagrow/terms/src/Middlewares/RegisterMiddleware.php(59): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#11 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): Flagrow\Terms\Middlewares\RegisterMiddleware->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#12 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/reflar/pwned-passwords/src/Middleware/CheckPassword.php(66): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#13 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): Reflar\PwnedPasswords\Middleware\CheckPassword->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#14 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flarum/core/src/Http/Middleware/ShareErrorsFromSession.php(58): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#15 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): Flarum\Http\Middleware\ShareErrorsFromSession->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#16 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flarum/core/src/Http/Middleware/SetLocale.php(51): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#17 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): Flarum\Http\Middleware\SetLocale->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#18 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flarum/core/src/Http/Middleware/CheckCsrfToken.php(25): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#19 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): Flarum\Http\Middleware\CheckCsrfToken->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#20 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flarum/core/src/Http/Middleware/AuthenticateWithSession.php(34): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#21 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): Flarum\Http\Middleware\AuthenticateWithSession->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#22 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flarum/core/src/Http/Middleware/RememberFromCookie.php(52): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#23 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): Flarum\Http\Middleware\RememberFromCookie->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#24 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flarum/core/src/Http/Middleware/StartSession.php(62): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#25 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): Flarum\Http\Middleware\StartSession->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#26 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flarum/core/src/Http/Middleware/CollectGarbage.php(48): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#27 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): Flarum\Http\Middleware\CollectGarbage->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#28 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flarum/core/src/Http/Middleware/ParseJsonBody.php(29): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#29 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): Flarum\Http\Middleware\ParseJsonBody->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#30 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flarum/core/src/Http/Middleware/HandleErrorsWithView.php(67): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#31 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): Flarum\Http\Middleware\HandleErrorsWithView->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#32 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/MiddlewarePipe.php(83): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#33 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/middlewares/request-handler/src/RequestHandler.php(84): Zend\Stratigility\MiddlewarePipe->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#34 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): Middlewares\RequestHandler->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#35 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/middlewares/base-path-router/src/BasePathRouter.php(97): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#36 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): Middlewares\BasePathRouter->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#37 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Middleware/OriginalMessages.php(41): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#38 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): Zend\Stratigility\Middleware\OriginalMessages->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#39 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/middlewares/base-path/src/BasePath.php(53): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#40 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/Next.php(60): Middlewares\BasePath->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\Next))
#41 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/MiddlewarePipe.php(83): Zend\Stratigility\Next->handle(Object(Zend\Diactoros\ServerRequest))
#42 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-stratigility/src/MiddlewarePipe.php(72): Zend\Stratigility\MiddlewarePipe->process(Object(Zend\Diactoros\ServerRequest), Object(Zend\Stratigility\EmptyPipelineHandler))
#43 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/zendframework/zend-httphandlerrunner/src/RequestHandlerRunner.php(95): Zend\Stratigility\MiddlewarePipe->handle(Object(Zend\Diactoros\ServerRequest))
#44 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/vendor/flarum/core/src/Http/Server.php(46): Zend\HttpHandlerRunner\RequestHandlerRunner->run()
#45 /var/www/vhosts/infosecforge.io/discuss.infosecforge.io/index.php(22): Flarum\Http\Server->listen()
#46 {main}
Interestingly, I have another site set in exactly the same manner which works !