If a feature of Enable Mastodon Apps doesn't work, it could be that on your specific WordPress setup a server-side error occurs. If you would be so kind to report as much detail about the error as you could, Thank you!

These might be PHP fatal errors. In that case, the Server Error log that your hosting service might provide would be useful. This is because an error occurred that stopped PHP which prevents the in-plugin error logging from working.

This is either an API that hasn't yet been implemented, or an unexpected parameter is received for an implemented endpoint.

Please turn on debugging like this (start at the Mastodon Apps settings page) and try to reproduce the error in the app.

Then you will see the requests like this (reload the page in your browser while you do things in your Mastodon app):

Highlighted in orange are the HTTP status codes. Numbers in the 400 or 500 ranges indicate errors. Could you then create a new issue the expanded version by clicking on the arrow? It should show the parameters the app sent.

Thanks!