Open University: Error No PI - Hell of registering.

I've been seeing this for months, and cannot register let alone pay for a course. The telephone lines keep cutting off on me when they transfer me, and the funding pages at OUSBA have no way to apply online unless transferred via the OU site which I cannot use:

Open University: Error No PI

Update 19/3/2021: After many phone calls and emails I finally get a different access username and then everything works. I can see all details online and enrol on modules should I wish to.