Unable to connect to Paypal

We’ve spent half a day trying to get EDD connected to Paypal.

Regardless of what we do, we get this message on the Paypal screen:

Connection failure: Please ensure browser popups are enabled then click the button below to connect again. If you continue to experience this error, please contact support.

But here’s the thing – we ARE getting connected to Paypal, and go through the same process over and over and over. And in the end, we get:

Thanks for choosing Paypal, etc.

You’re all set to start accepting payments when you sell on Easy Digital Downloads, etc.

And we’re brought back to the website – where we get the connection failure message again.

No cache running. We’ve turned on debug in EDD, and here’s what the log reports:

2022-6-30 13:27:12 – PayPal Connect – Checking merchant status.
2022-6-30 13:27:13 – PayPal Connect – Failed to retrieve merchant status from PayPal. Error: %s

Any clue?

Thanks so much!