Hi Last name,
Thank you for your detailed explanation. It looks like you've already followed the recommended steps, but the issue persists.
To help resolve this further, I recommend raising a support ticket so our support team can assist you directly. Please refer to the following link for instructions on how to create a support ticket:
https://support.serviceshub.microsoft.com/supportforbusiness/create
We appreciate your engagement and thank you for being an active part of the community.
Thanks,
Lakshmi.