@arubislander
I am running Ubuntu Touch 20.04 (r767) right now.
I tried connecting the keyboards on the stable version in the past, but since it didn't work I installed this version.
I tried running Focal on the Pinephone as well, but that didn't work.
I don't have a computer with bluetooth that I can test the desktop version on unfortunately so I can't test that, sorry. I know they work on android though

@kugiigi
Fascinating.... Maybe I need to find one without a trackpad, since that is something I haven't tried yet. I ordered ones with one since having a trackpad is useful, but i'd rather have a working one.
What you mention with having to reboot I also experienced, but when I have a keyboard connected through a 2.4GHz USB dongle. Sometimes when I plug it in, nothing works, then I restart the phone while having the 2.4GHz dongle connected, then it works.
It seems mice/keyboards, bluetooth or not are very janky in UT at the moment. Maybe the fix is something simple, but I'm not knowledgable enough to do it myself.

I have been trying to connect a bluetooth keyboard to my Pixel 3a but nothing I do works.
I tried these 3 brands of keyboards:
Rii K06 Mini
G60S Pro - two of them
Logitech MX Keys

They appear connected in the bluetooth menu, but none of the buttons or the trackpad do anything. I tried manually connecting some of them through the terminal, setting them to trusted, but they still don't work.

Specifically the G60S Pro - I tested it and it worked out of the box on a Pinephone running Arch + Phosh, but it didn't work on the Pinephone running Ubuntu Touch.

I have also tried connecting a bluetooth mouse, an MX Master 3, but that gives the same problem - connected, but not working.

Has anyone been able to get a bluetooth keyboard to work with their phone? Is there some X/Wayland config file that I need edit?