Hi everyone,
This is driving me crazy. I have a flow to create documents and add them as a tab to a new channel in Teams. All the hard stuff is working apart from the adding the tab. I've been reading the docs here
In the Graph explorer the PUT call works fine
working good
but in my Flow it fails, I cannot see any difference between them

There's no useful error message
{
"error": {
"code": "UnknownError",
"message": "",
"innerError": {
"request-id": "c23e4732-0d33-4a08-9d54-d8d598e2baf7",
"date": "2019-11-27T19:06:33"
}
}
}
Can anyone spot something I'm missing as I'm starting to wonder if it simply doesnt work?