Gboard Keyboard Not Showing Up in Various Google Apps on iPhone Xr iPhone Xr 
iOS 12.4
Gboard 2.2.0.247258495
Gmail 6.0.190602
Docs 1.2019.28202
Chat 0.156.259040960


Issue:
I various apps developed by Google, such as Gmail, Docs, Chrome, Chat, the Gboard keyboard is not appearing. Nor is the "globe" icon that should allow one to switch between keyboards. Instead, I'm left with only the basic keyboard.

Screenshots:





Things I've tried/reviewed:


Reinstalling the apps where I'm seeing the issue
Reinstalling Gboard
Restart of iPhone
Tapping where the "globe" should be
Within Settings, rearranging the Gboard keyboard to not be the default
Within Settings, confirmed that the Gboard keyboard has Full Access
Ensured all individual apps, as well as iOS itself, are up to date


Has anyone experienced this issue or have any suggestions of what else to try to resolve this?
I'm having the same issue and like you I've tried everything from reinstalling to trying different custom keyboards. Only the default keyboard and emoji keyboards work in the google apps like gmail, hangout, meet etc. I can't find a lot of people complaining about the issue online so I figured it might be because this is a company device and some permission is blocking it? The custom keyboards work in all other apps so gboard not working with google apps is just baffling.