`invalid_service` error in slack slash commands

See original GitHub issue

Description

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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.

Bug Report

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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: Not Applicable

node version: 12.x

OS version(s): Windows 10

Steps to reproduce:

Create a slack app and create a new slash command, add url, details, etc.
Reinstall the app on development workspace
Open slack client, type the slack command (which is visible in the popup meaning it has synced)

Expected result:

Slack accepts the command and hits my provided url using HTTP POST verb along with payload

Actual result:

Slackbot returns a silly error “failed with the error invalid_service”. My endpoint doesn;t receive any hit from slack.

P.S. Sometimes the command is there in the popup but its details like description, etc are gone as shown in screenshot # 2. Then, I reinstall the app and it comes back as shown in screenshot # 3.

I’ve googled a lot about this problem searched YouTube but didn’t find any clue about whats wrong with it. Please help me I’m working on a project and deadline is really near 😞 I’ve spent a whole day meddling with it but to no avail.