Try reconnect my bank i put details then go to auth on bankapp then return to quickbook and nothing happens and i reload the page i get a blank page?

Thanks for coming by, @Fa property.

Let's get your bank account connected. Let's perform some basic troubleshooting steps to fix this. Open QuickBooks Online (QBO), use the incognito mode or private browsing. This is to determine if this is a cache-related issue. 

You can follow the steps to bring up a private window:

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

Once signed in, go back and connect your bank account again. If you're able to connect, return to your regular browser and clear your browser's cache. This process will optimize the QBO performance.

In addition, here's a reference that provides details about banking. Feel free to choose from the topics: Find help with bank feeds and reconciling accounts.

Please know that you're always welcome to reply anytime if you have follow-up questions or concerns with bank connections. I'll be around for you. Take care and keep safe.