Received an email from Flow that flows are being turned off due to "the trigger has encountered an authentication error".

Went to Flow to try and reauthenticate and while it goes through the first few authentication steps it never seems to complete. When clicking 'Test' in Connections Settings ALL connections reply "Request was formatted incorrectly"
I have cheeked in 2 separate Zoho One / Flow accounts and both have these issues.

What's happening?