Exactly the same for me, any Chromium based (PC) browser does this so I had to make a recent purchase with my CC instead. After playing around I found Chrome on Android does work but Edge/Chrome & Brave browsers on PC give a blank screen when using a 2FA app at the point of it asking you for the code. Basically, PayPal have broken their page for 2FA app security. I have had to turn off 2FA using an app to be able to login to PayPal on my PC (I don't use Firefox).
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