I am trying to link my bank with santader, it accepts on santander then says on your end "oops unable to conntect bank" i have tried multiple times

You can usually clear that error by checking for bank maintenance or a browser issue, as these often block the connection when linking your account. I suggest looking at your bank's site for any advisories, as QuickBooks relies on the bank to connect successfully and pull transactions into the system.

If there are no issues there, you can access your QuickBooks Online account in an incognito window or a different browser to see if that's where the issue stems from, and ensure your internet connection is stable.

If the issue persists, I recommend contacting our QuickBooks Online live support team so they can check it with their tools and get it fixed. 

Let me know if you have other questions or concerns.