Would anyone be able to advise me how to link my account with barclays business banking? I tried to do this recently but still unable to send an invoice to a customer

I'm here to ensure that you’re able to link your Barclays account in QuickBooks Online, @carthygardens-gm. 

With just a few clicks, you can link your bank account to QBO. I'll show you how.

1. Go to Banking from the left pane then click Connect account or select Upload transactions if you already have an account.
2. Search for your bank and select Continue. Read through the terms and conditions, then select Agree.
3. Follow the steps on your bank's internet banking page to authorize QuickBooks to connect to your bank account. Once you authorize the connection, you’ll be redirected back to QuickBooks.
4. Choose the bank accounts you want to connect, and which accounts they will link to in QuickBooks then click Connect. 

Here’s an article you can read for more information on the process: Connect your bank feeds to QuickBooks Online.

Also, did you encounter any errors when sending your invoices? Any additional information will get us closer to the resolution.

Furthermore, I suggest reaching out to Barclays support team. There's a great possibility that there having system maintenance. Thus, you're unable to link your account.

In addition, I've gathered these articles to assist you in organizing your transactions and accounts:

• Categorise and match online bank transactions in QuickBooks Online
• Reconcile an account in QuickBooks Online

If you have any further questions or concerns about your bank transactions in QBO, please know that you can always tag my name. I'm here to help you in any way I can. Have a great day and stay safe.