Project ‘Nulide/findmydevice’ was moved to ‘fmd-foss/fmd-android’. Please update any links and bookmarks that may still have the old path.

Find My Device has moved (since V0.10, V0.12 as of writing) and if you are hosting the server yourself, you might have missed that and might be locked out of the website interface.

If you have autoupdates on FDroid for your client, maybe you did not see the info.