Cannot enrol in Windows 10 Extended Security Updates (ESU)

Hello,

I cannot enrol in Windows 10 Extended Security Updates (ESU).

I have Windows 10 version 22H2 installed, including KB5063709. OneDrive is installed.

I have tried several times via: 

Open Settings → Update & Security → Windows Update. I can get to the screen that says "Enrol in Extended Security Updates to stay protected", but after I press 'next', I get a blank window with a wheel of death. After about a minute the window dies.

Via a chat with one of the Microsoft support channels the problem may be relates to Windows Backup not working. I have tried several community articles to make this work, but cannot get it to work. I've also been told I need to go to Settings > Accounts > Windows Backup Make to make sure “Remember my apps” and “Remember my preferences” are turned on. but since I can't start Windows Backup, I cannot do this.

Obviously with the deadline for registering for extended security deadlines approaching fast I am rather concerned...

Please help.