It's great to have you here in the QuickBooks Community, An_Ur_DID.

Thanks for bringing this up. I'm here to help you get the support you need with the bank error 9999.

We haven't received any reports about the error 9999 when updating the Chase bank. Since you're unable to update your bank account, we'll need to get you in contact with our banking team for further help.

Our banking team needs to collect more information about the error happening on your end. To ensure you'll be able to get back on track, please reach them through this article:

Contact support (UK only).

Please let me know if I can be of any help by clicking the Reply option below. I'll be here to assist you.