To resolve the issue, install Exchange schema extension on-premise AD server, and then edit/sync “authOrig” attribute which is a list of senders that are allowed to send to the distribution group. To do this, follow th...
Connect to Exchange Online powershell: https://docs.microsoft.com/en-us/powershell/exchange/exchange-online/connect-to-exchange-online-powershell/connect-to-exchange-online-powershell?view=exchange-ps Then see the following link: https://docs.microsoft.com/en-us/powershell/module...
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Connect to Exchange Online powershell: https://docs.microsoft.com/en-us/powershell/exchange/exchange-online/connect-to-exchange-online-powershell/connect-to-exchange-online-powershell?view=exchange-ps Then see the following link: https://docs.microsoft.com/en-...