Before you can redeem your promotional offer, you must have a primary payment method for your account.
Promotional codes can be redeemed only once. You or someone else cannot reuse a promotional code.
Check the details of the promotional offer for the start and expiration dates. The date on the promotional offer must be current.
You cannot use a promotional offer to pay for an existing balance.
After a promotional offer has expired or the promotional amount runs out, your ads will continue to run, and we'll charge your primary payment method (postpay account) or deduct funds (prepay account). If you have a prepaid account and no funds are available, we'll pause the account.
Only one promotional offer can be active at any time.
A promotional offer may contain other restrictions. Be sure to read the details of your offer for terms and conditions.
For more information visit Microsoft Advertising site.