When main and sub accounts have the Customer Credit app installed the creation of a creditAccount happens in all of them. In this scenario there are cases where closing the creditAccount doesn't work, the folowing error appears:

Error while closing account.

We were not able to replicate or identify what causes this, in some accounts this issue does not occur.

NA, what can be done is change the credit limit to zero so the payment method won't work for the registered email.