I suggest to log in to your bank's website to look for maintenance updates. If they change their URL, you need to disconnect your bank account from QuickBooks. Then, you can add it again, like a new bank account.
My Bank Account (Barclaycard Buisness) connection expired on 20th Feb. Tried to re-authorise, but it won't work. I can connect directly to Barclaycard using same details
Thanks for your advice. I have followed it but I'm still not able to connect and/or pull down the transactions. I can use the same credentials to access the account directly with Barclaycard, so I'm content they are not the issue.
I've tried periodically to follow the process since I had the prompt that the connection was expiring on 20th Feb.
I spoke to the support team at Intuit and they asked that I retry after 20th Feb.
I spoke to Barclaycard who stated that its an issue with the link between Quickbooks and Barclaycard and was out of their control (3rd party software and all that).