L7 firewall rules would be best for this. There's no pre-configured rule for TikTok but you can block it via URL. https://community.meraki.com/t5/Security-SD-WAN/How-to-block-TikTok-in-2022/m-p/148333 In terms of effect, there's no real easy you can verify without testing. L7 firewall blocks aren't logged in the event log. https://community.meraki.com/t5/Security-SD-WAN/Why-are-layer-7-rules-not-logged-in-the-event-log/td-p/68122
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