Hi Mike,
Welcome to our forum.
By this issue, we suggest you use the following commands on Exchange server to compare this user’s attribute with working user:
Get-ADUser <UserName>
Get-Mailbox –Identity <Username>
Please make sure this specific account and working user has same UM mailbox policy.
If there are any questions or issues, please be free to let me know.
Best Regard,
Jim Xu
TechNet Community Support
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