A program that grants points for using Bing search, which users can redeem for gift cards, sweepstakes entries, or charitable donations.
Dear Hanz 67
Thank you for posting in the Microsoft community.
Recently, many community users have reported that they are unable to add a cell phone number to their Microsoft account.
We are aware of this issue and it may be a temporary server issue.
Below are alternatives to this issue:
Step 1: Log in to the following website:
https://account.live.com/names/manage
Add a new email address to your Microsoft account. Do not add the @outlook.com email address.
Please use the three-part mailbox like Gmail/Yahoo/Aol mail address.
Step 2: Set the three-part mailbox email address as the primary alias for the account.
Step 3: Add a new phone number to the account.
Step 4: Change the primary alias back to your previous @outlook.com email address.
Step 5: You can now remove the three-part email account you added。
I hope this solution helps you.
Looking forward to hearing from you.
Best Wish
Shawn.Z-MSFT | Microsoft Community Support Specialist