554 5.7.0 < #5.7.133 - sender was not authenticated when sending to this group

Hi,

I get NDR back when I send a mail outside from our organization to a specified address inside in our organization (dbh-group.com).

What is strange that the target address is not a group but a mail recipient. This is why I cannot find it in Groups in the Admin Center, so I cannot do those advices which are mentioned in this guide: https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-5-7-133-in-exchange-online

Here is the message:

Létrehozó kiszolgáló: VE1PR03MB6015.eurprd03.prod.outlook.com

******@dbh-group.com
Remote Server returned '554 5.7.0 < #5.7.133 smtp;550 5.7.133 RESOLVER.RST.SenderNotAuthenticatedForGroup; authentication required; Delivery restriction check failed because the sender was not authenticated when sending to this group>'

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