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Can you confirm that your Paypal pro account is fully activated and the billing agreement has been confirmed?
Also, since the error is unclear, I have submitted a ticket to the development team to be able to identify this error.
We'll get back to you as soon as possible.
The same issue is happening to me.
I attach a picture.
I'm also able to replicate the issue at my end. I think the Verify Integration in the new wizard is the same as Test Integration in the old wizard. You may continue with the wizard so that the integration wizard continues. Once the wizard is open, you can click on Back to test the API credentials. Please see the screencast below:
I see that the issue is already forwarded to our backend team to take a look. Once the issue is resolved, you'll be notified through this thread.
We have released a fix for this. Can you please confirm if the issue is resolved on your end?