http://ec2.{region}.amazonaws.com/#Action=RegisterTransitGatewayMulticastGroupMembers<p>Registers members (network interfaces) with the transit gateway multicast group. A member is a network interface associated with a supported EC2 instance that receives multicast traffic. For information about supported instances, see <a href="https://docs.aws.amazon.com/vpc/latest/tgw/transit-gateway-limits.html#multicast-limits">Multicast Consideration</a> in <i>Amazon VPC Transit Gateways</i>.</p> <p>After you add the members, use <a href="https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_SearchTransitGatewayMulticastGroups.html">SearchTransitGatewayMulticastGroups</a> to verify that the members were added to the transit gateway multicast group.</p>
{
"success": true,
"data": {
"id": "abc123",
"created_at": "2025-01-01T00:00:00Z"
}
}{
"success": false,
"error": {
"code": "VALIDATION_ERROR",
"message": "Invalid request parameters"
}
}1curl --request POST \2 --url 'http://ec2.{region}.amazonaws.com/#Action=RegisterTransitGatewayMulticastGroupMembers' \3 --header 'accept: application/json' \4 --header 'content-type: application/json'1{2 "success": true,3 "data": {4 "id": "abc123",5 "created_at": "2025-01-01T00:00:00Z"6 }7}http://ec2.{region}.amazonaws.com/#Action=RegisterTransitGatewayMulticastGroupMembers<p>Registers members (network interfaces) with the transit gateway multicast group. A member is a network interface associated with a supported EC2 instance that receives multicast traffic. For information about supported instances, see <a href="https://docs.aws.amazon.com/vpc/latest/tgw/transit-gateway-limits.html#multicast-limits">Multicast Consideration</a> in <i>Amazon VPC Transit Gateways</i>.</p> <p>After you add the members, use <a href="https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_SearchTransitGatewayMulticastGroups.html">SearchTransitGatewayMulticastGroups</a> to verify that the members were added to the transit gateway multicast group.</p>
{
"success": true,
"data": {
"id": "abc123",
"created_at": "2025-01-01T00:00:00Z"
}
}{
"success": false,
"error": {
"code": "VALIDATION_ERROR",
"message": "Invalid request parameters"
}
}1curl --request POST \2 --url 'http://ec2.{region}.amazonaws.com/#Action=RegisterTransitGatewayMulticastGroupMembers' \3 --header 'accept: application/json' \4 --header 'content-type: application/json'1{2 "success": true,3 "data": {4 "id": "abc123",5 "created_at": "2025-01-01T00:00:00Z"6 }7}