Hello there,
I'm here to provide steps that will help you connect your Barclays business account in QuickBooks Online (QBO).
There's a possibility that the link to your business bank account has changed, which is why you are unable to connect. This may direct you to your personal account instead. To ensure that you can connect to your business account using the correct link, please copy and paste your business bank's website link into the search box.
Moreover, I'm adding this helpful article as your reference in categorizing and matching your bank transactions once you're done importing them to QBO: Categorise and match bank transactions in QuickBooks Online.
Return to this post if you have other concerns about connecting your bank accounts to QBO. I'll be here to lend a hand.