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Dear Webbrewers,
Thanks for your updates.
If you confirm that there are no specific rules on your Exchange Online service, I'm afraid that the issue may be a feature configuration issue in your environment and it may involve our related team to be fixed. I suggest you contact the administrator if you aren't the administrator and let him open a support ticket to our related team as soon as possible.
Sorry for that our category may have limited resources to reach our related team directly.
Thanks for your understanding and effort!
Sincerely,
Cliff | Microsoft Community Moderator