Hi dianamccann52,
Welcome to Community! Connecting your Square account to QuickBooks Online makes importing your transactions effortless. I'd be happy to assist!
With regards to the message you're receiving, I suggest taking a look at this helpful guide to manage your settings and review how your customers are set up. This will provide a smooth transition to QuickBooks Online. If you require additional assistance, I recommend reaching out to Square Customer Support.
If you have other questions, feel free to reach back out. We'd be glad to help!