I am getting the same issues and phoned FD, they said it was a Quickbooks Issue although Im not convinced the lady I spoke to was at all sure what Open Banking is.  The weird thing is that on my phone when I log into my FD accounts and look at the Open banking tab it says under Account Information Sharing....

Active - No Authourisations

Inactive - Intuit Ltd

When I click on Inactive it shows...

Access Started 26/09/2019

Access Expired 25/12/2019

So it obviously worked at some point but not sure how to re-instate ?