Screen Pop API 403 Error "User not in experiment screen_pop

We are trying to test screen pop functionality using the API, but I am receiving the following error:

{
"error": {
"code": 403,
"errors": [
{
"domain": "global",
"message": "User ****2960 is not in experiment screen_pop_api",
"reason": "forbidden"
}
],
"message": "User ****2960 is not in experiment screen_pop_api"
}
}

Is this something that needs to be configured by Dialpad?

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Screen Pop API 403 Error "User not in experiment screen_pop_api"