Exchange error 5.7.136 SenderNotAuthenticated

Hi, we recevied a report from one of our sender that their distribution group mail recevied bounce email with error : "#< #5.7.136 smtp;550 5.7.136 RESOLVER.RST.SenderNotAuthenticatedForRecipient; authentication required; Delivery restriction check failed because the sender was not authenticated when sending to this recipient> #SMTP#".

However, if they send from user mailbox, this issue does not happen. It only happen when they send using distribution group mail. The NDR generated from their mail server. in SMG, we did not recevied any log mentioned about this attempt of delivery. any suggestion or help is much apprecaited.