I’ll help you resolve this so you can relink your account in QuickBooks, @redeyed_treefrog.
Before anything else, which bank account are you trying to reconnect with QBO? This way, I’ll be able to see if there are any related issues with your bank.
In most cases, slow internet speed and browser-related problems are common reasons why users have issues connecting to their bank. You can perform the resolutions below to get this fixed.
First, verify your internet connectivity. Then, open your QuickBooks Online account in a private or incognito window for testing. You can use these shortcuts keys below for quick navigation:
Google Chrome: Ctrl + Shift + N
Safari 11 or newer: ⌘ + Shift + N
Mozilla Firefox: Ctrl + Shift + P
Microsoft Edge: Ctrl + Shift + P
Once logged in, try to reconnect your bank account. If you can do it successfully, get back to your regular browser and clear its cache. Doing this helps the program to run better. You can also use other supported browsers as an alternative.