EDIT 9/13/24: This issue is still present with the newest update to 10.6. We've deployed an alternative solution since, so I'm not really paying much attention to this. I hope they fix this soon, since the update that broke this ironically fixed hardware keyboards.
We have a number of iPads with the latest version of iPadOS and the Microsoft RDP app that have a weird error. These are remotely managed iPads loaded with a few apps, but we primarily use the RDP app on these. I understand that usually these issues fall under Apple Support, but the thing is, this issue is isolated to the RDP app itself. No other app gives me the same issue.
Upon closing and reopening the app, I can log in just fine. The keyboard opens as intended, and I'm able to proceed. Once inside, I'm able to use the keyboard a few times for various apps, but when I close it, sometimes it refuses to reopen. This persists even through locking the session, when prompted to re-enter my credentials to log in via the app itself. The keyboard doesn't appear at all.
I've also tried disabling Bluetooth and enabling the "Show Onscreen Keyboard" option under Accessibility > Touch > AssistiveTouch. I've also enabled AssistiveTouch. No changes.
For a visual representation, see the GIF below. Pulling up the search bar, the keyboard works fine. However, in RDP, I tap the username and password field several times. You can see the AutoFill bubble pop up for half a second towards the end.

At this point, I'm at a loss. I do have full control over this iPad and can wipe it, but ironically I've done this and seen no changes in behavior. I'm thinking it may be an issue with the app. Has anyone seen this before?
TL;DR:
- Keyboard won't populate in RDP app, works elsewhere fine
- Turned on "Show Onscreen Keyboard" in AssistiveTouch
- Turned off Bluetooth
- Reinstalled RDP app
- Issue clears after restarting app temporarily, error persists after closing keyboard
- Error is inconsistent, sometimes keyboard works longer