Organizing and accessing contact information in Outlook.com
Hi,
The problem was fixed, as far as I know, with a server change.
Press Windows + R, type %localappdata%\Microsoft, and press Enter.
Delete the Olk and OneAuth folders.
Restart Outlook.
This only removes temporary Outlook data that will be recreated automatically. Your emails will remain safe.
Try saving the contacts again.
I look forward to hearing from you to get the results of the troubleshooting.