View your multicast domains to verify that they are available, and that they contain the appropriate subnets and attachments.
To view a multicast domain using the console
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Open the Amazon VPC console at https://console.aws.amazon.com/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 Associations tab.
To view a multicast domain using the AWS CLI
Use the describe-transit-gateway-multicast-domains