CiviCRM version 5.30.0, Wordpress 5.5.1, PHP 7.2.34
Single payments passed to PayPal proceed fine, but recurring payments are blocked by PayPal, reporting "Access Denied.
You don't have permission to access "/subscriptions?business=info [...]
PayPal technical support claims "Since your query parameter strings was passed with the special characters like "/wordpress/civicrm/?Dcivicrm%252F" which causing the access denied issues. "
We are using the standard CiviContribute resources with no special templates or other items.
Has anyone else hit this brick wall? How did you manage to resolve it?
Incidentally, we were able to create new recurring contributions until about 2 weeks ago with no system changes around the time of the failure.