Hi @Mark Ma ,
If the group has been synced from your local AD, the changes must make there.
You can edit groups in the admin center by clicking the link below.
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Our database system sync account to AD on-premise. then AD would sync the account to Azure AD
However, the Azure AD account is generated before AD on-premise sync via User created AD group from MS teams.
Now, because the group is using same email address with different user name.
It is given sync error.
Is easy fix to change group name from Azure ?