I recently configured Cisco DUO with our GlobalProtect. When a user connects in on Windows/Mac there is no prompt from the client to go approve the MFA on their phone. It just hangs waiting. Can I have GP prompt the user letting them know that further action with MFA is required to proceed?
Take a look through there to see if that helps. Step 6>3 may be what you need:
Set Enable Inbound Authentication Prompts from MFA Gateways to Yes
Also, DUO has a pretty good step-by-step on setting-up with GP:
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