Okay so I actually solved this almost by accident. For me the problem began after an Android system update, don't know if it's related. But somehow my phone had revoked the app's access to bluetooth. I could see the camera on the list of bluetooth ac...
I'm having the exact same problem (Android, bluetooth, Eos 250d) and have been using bluetooth connection to take photos outside with my phone as the remote. And you're saying I can only use a wifi? I tried turning on my phone's hotspot wifi but didn...