TypeError: Failed to fetch

Sendbird Voice/Video Calls JavaScript
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I am using SendBirdCall.min.js version 1.10.20.

My authentication code is as follows:

const authOption = { userId: USER_ID, accessToken: ACCESS_TOKEN };

SendBirdCall.authenticate(authOption, (result, error) => {
    if (error) {
        alert("ERROR: " + error);
        // Handle authentication failure.
    } else {
        SendBirdCall.connectWebSocket()
            .then(function () { } )
            .catch(function ()  { alert('ERROR - Unable to connect to socket'); } );
    }
});

I get the following error: TypeError: Failed to Fetch.

In my google console, I noticed the URL https://(app id here).calls.sendbird.com/v1/users/152_mari_colas/login emits the following error: ERR_NAME_NOT_RESOLVED.

If I remove “calls.” from the URL, I get a response. It is as if the url “(app id here).calls.sendbird.com” does not exist, but the APP ID is correct.

Has Sendbird removed API URLs with the word “calls” in them?