This problem persists. My 28 Degrees credit card has not been able to update since 28/10/2021.

None of the suggested remedies have worked.

The 28 Degrees hyperlink in "Quïckbooks Online" is different to the sites actual login page. The site linked from QBO opens a further page to actually log in (https://28degrees-online.latitudefinancial.com.au/access/login).

Perhaps using this hyperlink in the QBO "Link Account" module may fix this.