Unrecognized resource types: [AWS::EC2::TransitGatewayConnect]

[fortinetps]

Hi AWS CloudFormation Team,

Although you have this TransitGatewayConnect developed, but it doesn't seem AWS CFN supports this resource.
I was trying to create one but I got the error message: Unrecognized resource types: [AWS::EC2::TransitGatewayConnect].
I am testing this on us-east-2 region, I have no problem creating this Connect type attachment manually on AWS GUI console.
I also checked the CloudFormation designer, and I found out TransitGatewayConnect is not in the resource list on designer.

my simple test CFN script

{
"AWSTemplateFormatVersion": "2010-09-09",
"Description": "TransitGatewayConnect Test",
"Resources": {
"TGWConnectAttachment": {
"Type" : "AWS::EC2::TransitGatewayConnect",
"Properties": {
"TransportTransitGatewayAttachmentId": "tgw-attach-0ff383f319a48210b",
"Tags": [
{
"Key": "Name",
"Value": "test_tgw_connect_att"
}
]
}
}
}
}

CFN designer has no "TransitGatewayConnect" resource

Could you please check and fix the issue.

Thanks!
Don Yao