Unable to get bot events for multi-party DMs (MPDM/MPIM)

[avrin-123]

I have a slack app bot installed in my slack workspace.
My Slack bot isn't responding to @mentions in multi-party direct messages. Even though I've:

1. Added the required bot scopes - mpim:history, mpim:read, mpim:write
2. Added "message.mpim" in the bot event under event_subscriptions

The bot events aren't being triggered when the bot is @mentioned in these exisiting group conversations. What could be causing this issue?
I am also not able to invite the bot in to this existing group chat.

Steps to reproduce:

1. Existing multi party direct message with User1, User2 and User3
2. @ mention the bot app in the conversation

Expected result:

Receive event of type message.mpim. So that the event can be handled and respond back.

Actual result:

Not receiving message.mpim event

[github-actions]

👋 It looks like this issue has been open for 30 days with no activity. We'll mark this as stale for now, and wait 10 days for an update or for further comment before closing this issue out. If you think this issue needs to be prioritized, please comment to get the thread going again! Maintainers also review issues marked as stale on a regular basis and comment or adjust status if the issue needs to be reprioritized.

[avrin-123]

Hi Team, gentle reminder to look in to this. Thanks!!

[github-actions]

👋 It looks like this issue has been open for 30 days with no activity. We'll mark this as stale for now, and wait 10 days for an update or for further comment before closing this issue out. If you think this issue needs to be prioritized, please comment to get the thread going again! Maintainers also review issues marked as stale on a regular basis and comment or adjust status if the issue needs to be reprioritized.