can't add money to son's account

Use the Family organizer flow first:

1. Sign in with the organizer account at family.microsoft.com.
2. Find the child account.
3. Select Add money or Manage spending > Add Money.
4. Choose the amount, then select a payment method under Child's payment methods and complete Buy.

If it keeps failing, these are the supported checks:

1. Verify the payment method details are current. Banks may require extra verification before the transaction will go through.
2. Keep bank, card, and Microsoft account contact details up to date.
3. If adding the payment method itself is failing, open the child’s Spending page and use How to add a card under Child's payment methods. If the card is not accepted, try the postal code with and without spaces.
4. Check whether the account has hit balance or daily transaction limits. A Microsoft account can only add or redeem up to USD 1,000 per day, spend up to USD 1,000 per day, and hold up to USD 1,000 at one time, with some country-specific exceptions.
5. As a workaround, add money to a Microsoft account by redeeming a Microsoft gift card on the Redeem page.

If the issue continues, use Contact Microsoft Support from the billing support flow.

• Add money to your family member's Microsoft account
• Limits on the money in your Microsoft account
• Spending limits in Family Safety
• Troubleshoot payment option issues
• Add money to your Microsoft account