Can not create a shared mailbox

THAO GIANG 1 Reputation point
2022-02-03T12:32:56.797+00:00

Hi,
I've just moved from google workspace to Microsoft 365.
Everything looks ok but I could not create a shared mailbox because More than one accepted domain was found when searching for 'mydomain'. The following accepted domains were found: CN=mydomain\0ACNF:7169d572-615d-4f16-befd-d33e668927f0,CN=Accepted Domains,CN=Transport Settings,CN=Configuration,CN=mydomain.onmicrosoft.com,CN=ConfigurationUnits,DC=APCPR06A003,DC=prod,DC=outlook,DC=com and CN=mydomain,CN=Accepted Domains,CN=Transport Settings,CN=Configuration,CN=mydomain.onmicrosoft.com,CN=ConfigurationUnits,DC=APCPR06A003,DC=prod,DC=outlook,DC=com.

In fact, there are 3 accepted domains :
mydomain CNF:7169d572-615d-4f16-befd-d33e668927f0
mydomain (default domain)
mydomain.onmicrosoft.com

Please advise how to fix this issue.
Thank you,

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Andy David - MVP 141.1K Reputation points MVP
    2022-02-03T12:39:22.303+00:00

    thats an orphaned deleted accepted domain (0ACNF:7169d572-615d-4f16-befd-d33e668927f0)

    Did someone delete one in the past or something was corrupt?

    Where are trying to create the accepted domain? Directly in Exchange Online or as remote mailbox on-prem?