Invalid routing number

I’m trying to use a different account to make my kids mission payments. As soon as I click that the account is a checking account the invalid routing number pops up and doesn’t go away even after putting in the correct routing number and account number. Then when I try to click save it won’t let me move forward because of the invalid routing number. That number is 516300391 for our wells fargo account.

According to this page, 516300391 is a deposit number, rather than a routing number. I'm not sure exactly what that means, but maybe it's a clue.

This page might also be helpful:
https://www.wellsfargo.com/help/routing-number/