Hey there, @darren-s-morriso.
It's great to see you back in the Community. Let's work together to figure this problem out.
To clarify, can you please send a picture of the message you're receiving when trying to link the bank account to QuickBooks Online? This will give me a better feel of what may be happening in your account.
Note: If your Bank has updated their website recently, this may be the cause of the disconnection with QuickBooks Online. Often, QuickBooks Online will need to talk with your bank and the updates they made so we can edit the login for it on our end.
Use this guide for future references to help your business out: Connect bank and credit card accounts to QuickBooks Online.
I want to ensure that you get this taken care of as soon as possible. I'll be back around shortly!
