node-slack-sdk: 404 when attempting to use sendMessage in RTMClient

Description

Issue when sending messages using the rtm.start() function. 404 being raised.

What type of issue is this? (place an x in one of the [ ])

• bug
• enhancement (feature request)
• question
• documentation related
• testing related
• discussion

Requirements (place an x in each of the [ ])

• I’ve read and understood the Contributing guidelines and have done my best effort to follow them.
• I’ve read and agree to the Code of Conduct.
• I’ve searched for any related issues and avoided creating a duplicate issue.

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Bug Report

As of yesterday the rtm-client seems @slack/rtm-api seems to be returning a 404 each time it attempts to connect to slack.

const {RTMClient} = require('@slack/rtm-api');
const rtm = new RTMClient(SLACK_TOKEN);
rtm.start();

Packages:

Select all that apply:

• @slack/web-api
• @slack/events-api
• @slack/interactive-messages
• @slack/rtm-api
• @slack/webhooks
• I don’t know

Reproducible in:

package version: 5.0.3

node version: 10.15.3

OS version(s): Linux

Steps to reproduce:

Run the following code.

const {RTMClient} = require('@slack/rtm-api');
const rtm = new RTMClient(SLACK_TOKEN);
rtm.start();

Expected result:

Expect for us to be able to use the RTMClient

Actual result:

404 is raised.

[ERROR]  RTMClient:1 A websocket error occurred: Unexpected server response: 404
[ERROR]  RTMClient:1 A websocket error occurred: Unexpected server response: 404