I cant link my halifax account to the app, when the bank does the authentication bit it says my number is incorrect.

Hello there, georgehopkins0-g.

Currently, we have an ongoing investigation regarding the Halifax and QBSE connection. Our engineers are already working to fix this. 

The suggested workaround would be to import the bank transactions through a CSV file. You can use this link to know more about it: Manually import transactions into QuickBooks Self-Employed.

After that, you can already categorise your bank transactions like you usually do.

Meanwhile, you can reach out to our Customer Care Team so they can add your profile to the list of affected users. Once they receive updates from our engineers, they can share it with you. You can see the steps to get in touch with them in this link: Contact QuickBooks Self-Employed Support.

We'd appreciate your patience as we work on this.