Revolut API

I am trying to add non-Revolut Counterparty via api, but i always get the Invalid request error. Note that i am using the sandbox and i am adding the individual_name fields and iban, bic field.

It’s an old topic, but I can’t make new so here is my problem:
I tried to authorize Wallet by Budgetbakers, I got the code in sms, but I can’t type it in the input field. Anyone with same situation?