Dear respected GarethIrwin1,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
I’m sorry you’re having a problem with sign into OneDrive but based on your description we can work together to resolve it.
For the situation you encountered, we deeply understand the inconvenience caused and apologize for it.
First please accept mt apologize.
Since you mentioned you check activate TSL 1.2 in internet settings on your Windows 11 OS, but the problem still persists. I assume you also restart pc after turning on TSL 1.2.
As per your error message after research a lot, I found some users fix this error message by changing/switch the language setting to English:
Also, this problem might be occurring secure Mail App activated a System-Proxyserver. After deactivating the System-Proxyserver try to log in.
Also, if you have set up a VPN or network proxy, please temporarily disable it to see if you can log in.
If above is already checked and doesn't work, then I think this issue might be raised by your local environment (Settings, Registry).
Given this situation, try to Create a new user account (for test purpose) under your Windows 11. See if it still alerts you with the same error message. It is worth trying because it will help you narrow down whether the issue is caused by a specific corrupted user profile.
Appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely,
Waqas Muhammad