Hi @Ayan Usmani
You can assign a manager to a user only after it has been created.
PUT https://graph.microsoft.com/v1.0/users/10f17b99-784c-4526-8747-aec8a3159d6a/manager/$ref
Content-type: application/json
{
"@odata.id": "https://graph.microsoft.com/v1.0/users/6ea91a8d-e32e-41a1-b7bd-d2d185eed0e0"
}
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