Got a strange one and have been following other posts regarding MTD VAT and authorising - so I am just wondering if someone has come across this specific one.
Client dials into a Win 2012 Remote Desktop; Opera 3 server is also a Win 2012 server.
When they click on MTD VAT Centre for a particular company, it asks to authorise. When you can click through the first two HMRC pages to allow the software to interact with HMRC, the 3rd screen is this:

I cannot get around this at all.
Interestingly, I had another site that had RDS win 2012 with the same issue. The server was win 2019 and that allowed the user to Authorise and has confirmed that even on the win 2012 it is fine now. So it seems it is a problem with just the win 2012 (but might be just a coincidence)...tried all the usual stuff re authorising except I cannot get the redirection tick box to re-appear; not sure if this is the same thing though... let me know.
Hoping someone has seen this before.
Cheers
Tony