curl --request POST \
  --url https://api.swarmd.ai/tenant-auth/v1/groups/{groupId}/members \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "userIds": [
    "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  ]
}
'

[
  {
    "user": {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "tenantId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "email": "<string>",
      "createdAt": "2023-11-07T05:31:56Z",
      "permissions": [
        {
          "entity": "USERS",
          "permission": "READ"
        }
      ],
      "firstName": "<string>",
      "lastName": "<string>",
      "groupIds": [
        "3c90c3cc-0d44-4b50-8888-8dd25736052a"
      ]
    },
    "groupId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "assignedAt": "2023-11-07T05:31:56Z",
    "assignedBy": {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "tenantId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "email": "<string>",
      "createdAt": "2023-11-07T05:31:56Z",
      "permissions": [
        {
          "entity": "USERS",
          "permission": "READ"
        }
      ],
      "firstName": "<string>",
      "lastName": "<string>",
      "groupIds": [
        "3c90c3cc-0d44-4b50-8888-8dd25736052a"
      ]
    }
  }
]