The same problem on My side. The App worked fine without an additional MFA-challenge until I changed the iPhone to a new one. Since this moment I have to answer a MFA-challenge on every app usage. The security benefit is nearly 0 in this case, because the PayPal-App and the Authenticator is secured by the same FaceID configuration on the same iPhone. It will make some users switch off MFA again. I wish I could raise a feature request at the PayPal development…
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