Issues with hotel and airport WiFi

Does anyone else have issues with users connecting to guest WiFi networks, seems to mainly effect Mac users. When we set the users machine to a profile that has no Threat Protection features enabled the connection works, so it is not Web Control settings.

This is quite a tricky one to recreate and test on the bench so was wondering if anyone else has experienced this and has a solution short of turning off all Threat Protection features. 

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