Problem PayPay

after configuration
payments as follows:

Account ID or email address (sandbox): [email protected]

Sandbox – yes
More flexible – yes
Currency: PLN

PayPal account: business

paypal messenger:
“Something not so good. later later.”

https://www.sandbox.paypal.com/webapps/shoppingcart/error?flowlogging_id=f3053985eba0e&code=INVALID_BUSINESS_ERROR&mfid=1676122394649_f3053985eba0e

What is wrong?

The page I need help with: [log in to see the link]