Error converting value \"mcp\" to type 'Microsoft.Azure.ApiManagement.Management.Contracts.ApiTypeContract'.

I attempted to create the MCP Server with the new preview feature and got this message:

{
"error": {
"code": "ValidationError",
"message": "One or more fields contain incorrect values:",
"details": [
{
"code": "ValidationError",
"target": "representation",
"message": "Parsing error(s): An error occured while parsing the input. Message: Error converting value \"mcp\" to type 'Microsoft.Azure.ApiManagement.Management.Contracts.ApiTypeContract'. Path 'type', line 2, position 15."
}
]
}
}

I did verify I have AI Gateway Early set for my updates.