Calling the following code:

$uri = "https://graph.microsoft.com/v1.0/groups/[groupID]/members/`$ref"
$body = (@{'@odata.id'='https://graph.microsoft.com/v1.0/directoryObjects/[memberID]'} | ConvertTo-JSON)
Invoke-WebRequest -Method "POST" -Uri $uri -ContentType "application/json" -Headers @{Authorization = "Bearer $retrievedToken"} -Body $body -UseBasicParsing -Verbose


Invoke-WebRequest : { "error": { "code": "Request_BadRequest", "message": "No URI value was found for
an entity reference link. A single URI value was expected."

Obs.: The same request in Graph Explorer works as expected.


Worked with:

$uri = "https://graph.microsoft.com/v1.0/groups/[groupID]/members/`$ref"
$body = (@{'@odata.id'='https://graph.microsoft.com/v1.0/directoryObjects/[MemberID]'} | ConvertTo-JSON)
Invoke-WebRequest -Method "POST" -Uri $uri -ContentType "application/json" -Headers @{Authorization = "Bearer $token"} -Body $body

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