You're in the right place, @darren10. Happy to help out.
Some banks enforce security protocols that require you to enable the ability to add more than one account to a single connection. I recommend reaching out to your bank to see if this is the case and if they can allow you to connect all 3 accounts using a single connection.
If you'd like to learn more about setting up Bank Feeds in QuickBooks Online, I recommend checking out: Connect bank and credit card accounts to QuickBooks Online
Keep me updated here, I want to ensure your continued success. Have a wonderful day!