Removed from old chat rooms after resetting password

Hello, Folks,

I've been with Reddit for years, and during that time joined many subreddit specific chat rooms, which as I understand were deprecated to simple group chats, those in those rooms being sort of grandfathered into the new group chats together.

I had to reset my password recently after a security breach, and upon getting back into Reddit found that I was no longer in any of the group chats, all of my previous direct message chats were gone, and after reaching out to someone in said group chat found I was unable to access the group chat again, seeing a 404 error when attempting to access the invite link.

Is anyone aware of how I can get back into those group chats?

Thanks in advance,