mrnaterpg thanks!
First observation, 10.3.38-MariaDB
is now over 5 years old and no longer supported. Although I don't believe this to be the cause of your issues, I do strongly suggest to upgrade to 10.11 (LTS)
A subdomain installation shouldn't have an impact, but it does cause an issue from time to time when extensions don't generate their base URL's correctly for example.
What I would suggest as a next step is to enable debug
, and try to enable the extension again. This should give us output either in the console, Flarum UI, or in the logs (/storage/logs
). If you can share that, I'll have a much better idea what is going on..