Hey there! Nice to meet you!
Just to clarify, since you mentioned these, "They could add my cellphone number to my Microsoft account. I have contacted Bing Rewards and have heard back from them."
Do you mean Microsoft Support is unable to add your phone number to your account, and that you have contacted Bing Rewards Support as well, but you haven't received any response from them yet, is that correct?
May I know the exact error messages/codes upon attempting to add your phone number to redeem your reward points?
Lastly, may I know the troubleshooting steps you have done so far to fix the issue?
Best regards,
Darhyl