Unfortunately it doesn’t work if you have a personal Barclaycard and a business current account - it’s one or the other when trying to add them together or one overwrites the other when adding them separately.
It appears that you can’t have an open banking feed for a combination of personal and business accounts with Barclays. Selecting a personal account or Barclaycard in the Barclays open banking authorisation window immediately greys out the Buiness tab and vice versa.
For me it’s the same login for both personal and business accounts - it may be different if you are a corporate customer I guess.
I can see 2 tabs in the app and these tabs are reflected in the online banking feed authorisation window, one for personal accounts, one for a business current account. It will not let you select or add accounts from both tabs simultaneously.