I recently came across this issue as well. I am running Windows 10 with Avast 12.3.2280 (build 12.3.3154.2) and Pulse Secure 5.2.4 (787). Pulse Secure does not acknowledge Avast as a valid antivirus software. As mentioned previously, the workaround of disabling Avast and enabling Windows Defender is a viable but undesirable solution.
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