I'll share some details regarding the connectivity issues and make sure you can connect Yorkshire Bank to QuickBooks Online (QBO).
Some customers are unable to connect their accounts but this is already resolved. May I know the message you encounter when connecting bank to QBO? It can help me check if we have a reported issues related to your concern so that I can provide you with the best resolution.
For now, we can try some troubleshooting steps to update it. Let's start with updating your bank account manually. It refreshes the connections between the bank's website and QuickBooks.