To establish the account
For consumers who have no Mobile phone, allow a Friend's Mobile number for 6-digit code without redeeming a reward for verification.Once the account is verified one can redeem without 6-digit code.
PS. Joey's suggested process is cumbersome and unnecessary.
Apologies for the confusion. Microsoft Rewards members without a mobile phone are allowed to use a friend or family member’s phone number to complete the redemption process. The phone number is used for verification purposes only and is not saved or used anywhere else.