I'm troubleshooting my incoming call problem and found, I think, a bug:

I disabled presence from the main screen. When I did that it says "you can re-enable it from settings"

I went in to settings, set presence to Auto, save settings.

I'm returned to the main screen and immediately see the bubble about re-enabling presence from settings.

If I tap the name of the account, I don't get the Presence options.

If I go back into settings, Presence is still set to No. It wasn't saved.