Hello @Lanky Doodle ,
if find an answer, please write it here. I've got the same problem, I cannot deploy a Windows 11 image with two different "Teams" apps where one is not working.
I found that the Teams Preview app is not included in the OS image, just the Chat button and some advertisement for it. You can verify this by installing Windows 11 without Internet access. However, if there is Internet connectivity available, the Teams preview app is automatically downloaded and installed in the background even if you disable the Chat button by group policy.
I also tried to find out to no avail how the background download is triggered.
One important thing I found out: in Windows 11 you must not remove Cortana (Microsoft.549981C3F5F10_2.2106.2807.0_neutral_~_8wekyb3d8bbwe) from the image as this will break several other apps like Store and Editor. Can't remember the details, but there was a similiar bug in an older Windows 10 release.
Best regards,
Fred