Hello hhyatt,
Thanks for reaching out to us here. QuickBooks Online enables you to make accounts inactive, so your chart of accounts remains organized. I can see how the error you're getting with regards to Square accounts, can impact your QuickBooks goals. I would be glad to assist!
If you've set up automated work flows in square, you'll need to deactivate or delete them, before making the accounts inactive in your QuickBooks Online account. You'll need to reactivate your Square account in order to make any changes.
Should you require additional assistance, please don't hesitate to contact the Square Support team.
Feel free to reach back out with any other questions. We would be happy to help!