When adding Square transactions under "App Transactions", I'm getting this error for several: "We couldn't Add the transaction(s) due to "Code. Try again later."

Hi there joshc-gritbooks-,

It's vital that all your transactions are entered properly so that your books can be well balanced. QuickBooks Online is a great tool able to connect to various services through apps to help import data so that you can save time with data entry. I can point you in the right direction for assistance with missing transactions.

For assistance with the missing deposits from Square, I recommend reaching out to the QuickBooks Online support team outside of the Community site. They'll be able to view your account with you in a secure environment to provide some troubleshooting steps to help with the missing deposits, as well as notify our engineers if the issue is still persistent. You can reach them using these steps:

Schedule a Callback or start a Chat: click (?)Help in the upper right > type and enter "Contact support" into the QB Assistant > click Contact Us > explain your situation > click Let's Talk > choose Get a callback or Start a Chat.
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If you have any other questions, feel free to reach out here.