Error " Flow with name: could not be found" in Activate Flow

[AshV]

I am passing file with below Json content in Activate Flow step, It is not able to get flow name somehow and throwing this error.

Error -> Flow with name: could not be found

Json Content ->
{
"Flows": [
{
"FlowName": "My Cloud Flow Name",
"ShareWith": [
{
"PrincipalType": "User",
"Principal": "adm**@comp**.onmicrosoft.com",
"RoleName": "Owner"
}
],
"State": "On"
}
]
}

Is it something wrong in my syntax or this is from the library side. Please help me out