My original assumption was faulty. I assumed that I would be able to block everything except for Zscaler traffic. This did not work. Even though the traffic is bound for Zscaler, it still gets blocked by the MX. The Meraki firewall must still see the url and blocks it. I think that BrechtSchamp is right. I would have to block traffic at the L3 firewall for this to work. Thanks for the help.
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