Hi all, just posting this as the issue has been active for a few years now

After a certain steam mobile update, when trying to checkout on the Steam App (Android) and using Paypal while 2FA is active, you will not be able to complete the purchase because when the 2FA security code window appears and you enter the code, it fails to progress to the next screen.

This happened after a specific steam mobile update and has never been fixed since, to checkout with paypal I am required to log directly into the steam website on mobile or wait until I am on my computer.

Replication is easy, try to checkout on steam mobile with a paypal account that has 2FA authentication enabled. I can replicate this 10/10 times.