Allow me to dive into this thread to assist you, @monster. I’ll provide you with the details about PayPal Credit not connecting to QuickBooks Online (QBO).

To fix this, we can try signing in to your QBO account using a private browser or "incognito" mode. This can help your computer or device run more efficiently by preventing interference from extensions, plugins, or cookies. Here are the shortcut keys for these browsers:

Google Chrome: press Ctrl + Shift + N
Mozilla Firefox: press Ctrl + Shift + P
Microsoft Edge: press Ctrl + Shift + N
Safari: press Command + Shift + N

Additionally, you can resolve this issue by connecting your PayPal Credit while in incognito mode. If that doesn't work, try using a different supported browser.

Moreover, it also might be due to recent changes in the bank. If so, you can follow the steps given by my colleague, Rubielyn. For a detailed steps, you can check this article: What to do if you get a bank error or can't download transactions in QuickBooks Online

If the issue you are facing persists, the best course of action in the meantime is to contact our Customer Support Team. Please make sure to review their Support hours to know when agents are available.

I also added these articles which can guide you on how to retrieve transactions from your bank or credit card and manually import them into QBO. Additionally, you can classify these transactions based on how similar transactions were categorized by other customers, which can help you identify tax deductions and track your business's income and expenses in QBO:

Manually upload transactions into QuickBooks Online 
Categorize online bank transactions in QuickBooks Online

If you have any further questions regarding PayPal Credit not connecting to QBO, don't hesitate to contact us. The Community is always available 24/7. Take care!