To change your credit card number on your Microsoft account, you cannot directly change the card number on an existing payment method. Instead, you need to replace it with a different payment method. Here are the steps to do so:
- Sign in to the admin center.
- If you're using the Simplified view, select the Products tab, then select View payment methods. If you're using the Dashboard view, go to the Microsoft 365 admin center > Bills & payments page, and select the Payment methods tab.
- Select the More actions button (three dots) for the payment method you want to update, then select Edit.
- In the Edit payment method pane, update your payment method information, including the name on the credit or debit card, billing address, or expiration date. Note that you must enter the security code before any changes are saved.
- Select Save to apply the changes.
If your card number has changed due to loss, theft, or expiration, you will need to add a new payment method and then delete the old one if necessary.