(Process w3wp.exe, PID 25480) “RBAC authorization returns Access Denied for user na.imtn.com/Users/UM_MWI. Reason: No role assignments associated with the specified user were found on Domain Controller BosBLRDC.emea.dc.com

This issue may be caused by the improper RBAC permission, please run below command to double check:
Get-Mailbox Identity | FL RoleAssignmentPolicy
Get-RoleAssignmentPolicy Identiy | FL Name,AssignedRole

In Active Directory Users and Computers you will find a new container called Microsoft exchange Security Groups. If you locate the group called Exchange Organisation Administrators and add your user in to this group it should resolve it.

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