Deregister members from a multicast group using Amazon VPC Transit Gateways
You don't need to follow this procedure unless you manually added a member to the multicast group.
To deregister members using the console
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Open the Amazon VPC console at https://console.amazonaws.cn/vpc/
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On the navigation pane, choose Transit Gateway Multicast.
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Select the multicast domain.
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Choose the Groups tab.
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Select the members, and then choose Remove member.
To deregister members using the Amazon CLI
Use the deregister-transit-gateway-multicast-group-members