Hello and welcome to the Community, jandahaulageswlt
We're not aware of any issues connecting to Santander bank in QuickBooks Online at the moment. Do you receive any specific error code (number in brackets) or message during the connection process?
For troubleshooting purposes, we recommend trying to connect your bank on the web as well as the app. To connect on the web, please log into QuickBooks through a private browsing/incognito window (on Chrome, press Ctrl + Shift + n at once to open).
We've got more tips on connecting your bank and credit card accounts to QuickBooks Online here. Please get back in touch if you require any further support.
