I've entered my details a couple times already but still it doesn't allow me to link my account my bank account to the app.

Thanks for reaching us today, user1976levy.

If you're not getting an error while connecting your bank with QuickBookse Self-Employed (QBSE) app, try the following:

• Search for your bank and make sure the spelling is correct.
• Try other listed versions of your bank's name
• Otherwise, you'll need to request support from your bank.

For complete instructions of the above mentioned, kindly visit this article: Find your bank or credit card account when you connect to online banking.

You can have this article for more information about connecting bank accounts in QuickBooks Self-Employed including the mobile app.

Check out this article for more information about using QBSE mobile app: Overview of the mobile app

I'm just a post away if you have other questions or concerns. We're always here to lend a hand. Thanks for posting and I wish you have a lovely day ahead.