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Let me share some details about the error 350.
We have reported issues wherein some of the customers are unable to connect Wells Fargo into QuickBooks Online and getting error 350 too.
While the investigation is ongoing, I'd suggest contacting our phone support team so we can add you to the list of affected users. This way, we can notify you via email about the status of the issue.
Here's how to contact them:
Thanks for your patience and please let me know if you have any questions. I’m always ready to assist. Have a good one.