Anyone know why I'm getting an error message when trying to agree my bank details?

Hello userjmhfightingfitne,

Can you share with me the error message you get?

In the meantime, let's run some steps to isolate what causes the error message. 

To start with, let's open QuickBooks in a private window. It is the best place to identify any browser-related concerns. You may use these keyboard shortcuts to open one:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Microsoft Edge: Ctrl + Shift + P
• Safari: Command + Shift + N

If the error disappears, you can go back to a regular browser and clear its cache. A piled cache can also be the reason for some unexpected issues on the opened pages. 

We can also switch to a different supported browser like Google Chrome, Mozilla Firefox, Safari, or Microsoft Edge.

I've also added this article with some information on fixing some bank errors: Fix bank upload errors in QuickBooks Online.

I'm just a post-away if you need help. Keep safe!