Hello and welcome to the Community, libby-gracie-ind
We're not aware of any current issues impacting the bank connection for the Co-operative Bank in QuickBooks Online.
Please confirm the account type that you are trying to update: Personal, Credit Card or Business Banking. Please note, Personal and Credit Card accounts use a different connection type called Strong Customer Authentication (SCA) to connect, meaning you'll need to enter your user ID and password when updating transactions. Thanks :)