curl --request PUT \
  --url https://{appid}.api-{region}.cometchat.io/v3/users \
  --header 'Content-Type: application/json' \
  --header 'apikey: <api-key>' \
  --data '{
  "uidsToActivate": [
    "tag1"
  ]
}'

{
  "data": {
    "nonDeactivatedUids": [
      "superhero2",
      "superhero3"
    ]
  }
}