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Dear Hanif888,
Good day! Thank you for posting to Microsoft Community.
Based on your description, we have received a number of requests on this, and the team is currently looking in the situation. I apologize for the inconvenience this may cause. In the meantime, the workaround is selecting the message with Time Stamp and name of the person you want, and while still holding the mouse button down, press CTRL + C and CTRL + V. Therefore, I will update this thread as soon as I get any additional information about the query and the fix timeline.
Also, if you have the organization admin permission, you can also raise a service request to report this symptom to our online channel through the O365 admin center. A support agent can further connect with you remotely, for further troubleshooting and involve the backend team where need be. Get support for Microsoft 365 for business -- Online support. I will also revert back when I get more info on this. Your patience and cooperation are much appreciated.
Thank you for your precious time. Have a nice day.
Sincerely,
Libeamlak | Microsoft Community Moderator