When I try to patch the birthday property on the https://graph.microsoft.com/v1.0/users/{userId} API The absolute lowest date i can add here is 1753-01-01. Please make it able so we can set this to null or at least 0001-01-01. If a user previously did not have a birthday the API returns 0001-01-01 but I can not update it as such. The graph API metadata says this field is not nullable, but in SharePoint you can set this field to empty. So I am assuming the contract the API has for updating it in SharePoint is incorrect.