Retrieve Amplitude ID with user_id through an API

Hi,

I am building an internal tool where I would like to take their user_id and call https://profile-api.amplitude.com/v1/userprofile to return the Amplitude ID of the user, so that I can link directly to their profile within the application.

Unfortunately, it seems like with amps_props=true set in the URL it still doesn’t return this property:

{
  "userData": {
    "recommendations": null,
    "user_id": "testUser",
    "device_id": "ffff-ffff-ffff-ffff",
    "amp_props": {
      "library": "http/1.0",
      "first_used": "2020-01-13",
      "last_used": "2021-03-24",
      "number_property": 12,
      "boolean_property": true
    },
    "cohort_ids": null
  }

Could you please advise if there is any way to get the Amplitude ID using the user_id?

Thanks,
Jarryd