Hello and welcome to the Community, David
The connection to Barclays Business Banking (UK) requires either the Membership number, Card number or Sort code and account number.
This information is requested by the bank and is not something that we're able to change. We'd recommend contacting the bank to see if they are able to provide you with a membership number for Open Banking purposes.
Thanks for reaching Intuit QuickBooks support on the Community today. If there is anything that we can help with, please do get back in touch!