Hi, I'm trying to reauthenicate my PayPal UK account to get the updated transactions. But it fails after I login with an error "failure to confirm it's you".

Thank you for bringing this to our attention, @digimerchant-uk. Your concerns are being taken seriously. 

We've received similar cases about this issue. I recommend contacting our support team so that you will then be added to the list of affected users and receive updates via email.

To contact our support team, here's how:

1. Sign in to your QuickBooks account.
2. Select the Help (?) icon.
3. Scroll down to select the Contact Us button and follow the prompts.
4. You will be able to request a callback or start a live chat with an expert.

For reference, I recommend going through this article: How to get help with QuickBooks. 

In the meantime, to reduce the impact of the issue, I suggest that you manually upload your transactions to QuickBooks using CSV files as a temporary solution. 

While we work on resolving this issue, please stay tuned for updates or communications on the progress. Your patience and understanding are important to us as we strive to assist you in enhancing your experience with QuickBooks Online.

Once everything's good, feel free to utilize this additional reference in categorizing your transactions and putting them into the right accounts: Categorise online bank transactions in QuickBooks Online. 

If you have any questions or concerns regarding your QuickBooks Online, please do not hesitate to contact us at any time. We are always available to assist you.