Hello the forbiddenVeg, for error 350 please can you follow this and see if it resolves it for you if not please reach back out to use so it can be looked into more. 

Error 350 bank account connection failed

If your bank connection has expired and you're unable to reauthorise the connection, simply reconnect the affected account and consent to another 90-day connection by following the steps in how to reauthorise your bank account.

Before you disconnect your account, review the transactions QuickBooks already downloaded from your bank. This prevents it from downloading duplicates when you reconnect.