@Richard Hahlen, Thanks for posting in Q&A. It seems there might be some residual settings or profiles left on your iPhone XR from the previous management by Intune and Airwatch. Here are a few steps you can take to try and resolve this issue:
1, Make sure there's no existing user profile under outlook and "VPN-devicemanagement".
2, Clear Safari Cache on the iPhone.
3, Reinstall outlook app.
If none of the above steps work, you might consider performing a factory reset. This will erase all data on your iPhone, so make sure to back up your data first:
Hope the above suggestion can help.
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