Pro Sites registration not working

New users are no longer able to register a new site.
Also, since setting up pro sites I have had issues with the trial period using PayPal Express & the subscriptions automatically renewing, I tried uploading the files in this thread, although that has not helped
https://premium.wpmudev.org/forums/topic/pro-sites-is-not-renewing-subscription-upon-paypal-ipn-call
I have enabled support access.
Thanks!