A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Hello Mariusz,
Good day!! Thank you for posting in Microsoft Community.
Per your description, it seems that you cannot share a SharePoint file with a specific email address. May I know if my understanding is right?
If yes, to my knowledge, Microsoft 365 Administrator/SharePoint Administrator can limit sharing by domain, if they have set up this, you cannot share content with the email domain that are not allowed.
Do you meet any error message when you cannot share the SharePoint file with that email address? You may check the Sharing experience and related error message described in this support article Domain restrictions when sharing SharePoint & OneDrive content - SharePoint in Microsoft 365 | Microsoft Learn
If my understanding of the scenario is not consistent with yours, feel free to point it out. I will continue helping you.
At the same time, I'd like to collect following information:
- Please provide a screenshot of the error when you cannot share SharePoint file, it will be very helpful for further troubleshooting, I will do my best to help you.
- May I know if the email is from an internal user or external user?
Look forward to your reply. Thanks for your time and cooperation!
Please understand that our initial reply may not always immediately resolve the issue. However, with your help and more detailed information, we can work together to find a solution.
Best regards,
Tina