Hi @Anonymous ,
You can add the other user in members group using following.



User Email is the email of the person you want to add in the group.
Here is the JSON scehma.
{
"type": "object",
"properties": {
"d": {
"type": "object",
"properties": {
"__metadata": {
"type": "object",
"properties": {
"id": {
"type": "string"
},
"uri": {
"type": "string"
},
"type": {
"type": "string"
}
}
},
"Owner": {
"type": "object",
"properties": {
"__deferred": {
"type": "object",
"properties": {
"uri": {
"type": "string"
}
}
}
}
},
"Users": {
"type": "object",
"properties": {
"__deferred": {
"type": "object",
"properties": {
"uri": {
"type": "string"
}
}
}
}
},
"Id": {
"type": "integer"
},
"IsHiddenInUI": {
"type": "boolean"
},
"LoginName": {
"type": "string"
},
"Title": {
"type": "string"
},
"PrincipalType": {
"type": "integer"
},
"AllowMembersEditMembership": {
"type": "boolean"
},
"AllowRequestToJoinLeave": {
"type": "boolean"
},
"AutoAcceptRequestToJoinLeave": {
"type": "boolean"
},
"Description": {},
"OnlyAllowMembersViewMembership": {
"type": "boolean"
},
"OwnerTitle": {
"type": "string"
},
"RequestToJoinLeaveEmailSetting": {
"type": "string"
}
}
}
}
}​