We currently have an ongoing product investigation in relation to this issue, would you like your details to be added to it and you will be notified once there is a resolution?
Hello there, @pete31.
I recommend contacting our Customer Support Team. This way, they'll be able to further check the connection between your bank and QuickBooks.
You can speak to our representative through the Contact us feature in QuickBooks Online. I'll guide you how:
I've included an article about matching and categorising bank transactions in QuickBooks Online. This will help you keep your books accurate.
For other QuickBooks related concerns, let us know so we can help.
Thanks for joining in on this thread, Nelly111S.
I checked our reports but haven't found any on-going investigation about the PayPal error code 355. We can perform some troubleshooting steps to fix this issue.
Let's open your QuickBooks Online account using the incognito or private browser. This mode doesn't store cache.
Here are the keyboard shortcuts:
Once signed in, try to connect your PayPal bank. If it works, go back to your regular browser and clear its cache. Clearing cache helps refresh your browser settings. Please make sure to restart your browser afterwards.
You can also use a different supported browser as an alternate solution.
Please let me know of the result. I'm here to help you out until a solution is found. Take care!