When I try try connect to my natwest bank, it says confirmed and returning me to intuit but then I get an error page saying authentication failed

Hello Rmspropertyservi, 

Welcome to the Community page, 

If you have the natwest banking app on that device could you please remove it then try connecting your natwest bank account up in quickbooks. Once it is connected then you can reinstall the natwest banking app again. If you still have an issue once trying that then let us know.