I have a similar issue with GlobalProtect 5.0.3 and Duo MFA. Not sure if everyone is aware how Duo MFA works with GlobalProtect, but instead of enter in a one-time passcode, you can enter in the number "1" and Duo will send a push notification to your mobile device. Well, I entered in "1", never got the push notification(not sure why), but this caused the GlobalProtect client to get stuck at "Still Working...". I waited 25 minutes and the client never timed out, it just kept trying.
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