MS Teams icon on iPad room controller keeps disappearing

[JPMunson]

My org has 40+ Zoom Rooms that use iPads as the controller. I have added the MS Teams icon to all of them and for the most part it works fine. However, there are a few that keep dropping the MS Teams icon.

We keep all of our devices updated to the latest software versions, I have ran the Powershell commands to make sure all calendars are the same as far as settings are concerned and as stated above, roughly 37 of the rooms have had no issues for months. Teams meetings appear on the calendar with the Join button enabled.

Recently, I have been working in one of our Boardrooms, uninstalled all Zoom software, cleaned the PC running Zoom Room client, reinstalled, same on the iPad. The first time the icon appeared on the Home screen and worked fine but then it disappeared a few days later. 

When I tried the same process again it does not appear, Teams meetings will show on the calendar but no Join button and no icon.

If anyone has seen this type of behavior, could you let me know if you were able to fix it and what had to be done?

Thanks