Cannot delete unsolicited group chat from a group from which I removed myself

Since 2022 I have intermittently attempted to remove an unsolicited group chat message sent to me when I was added to a group chat I did not desire to join. During my most recent efforts I posted this thread to answers.microsoft.com. There a Microsoft Agent/Moderator recommended I post a discussion here, to "see if any of the Teams experts can come up with some ideas."

I have attempted to delete this group chat message using the Teams Windows app, mobile app, and the Teams web app. None of these were successful. I have uninstalled the Teams Windows app from my laptop and have run Revo Uninstaller. But when I reinstall the Teams app, the group chat is still there.

I am unfamiliar with what data having to do with my chats is synced with the cloud, but I suspect that is the source of this problem. But I can find no means of deleting any chats that are synced to the cloud. If there is a means to do so, I'd like to try that.

In any case, I am open to any solutions those here at techcommunity.microsoft.com can offer.

To sum up:

In 2022 I was added by "Unknown User" to a group chat that I did not desire to be part of. I removed myself from the chat but immediately found I could not actually remove the chat from Teams. As you can see in the image below, there's nothing in the left-hand Chat pane that I can use to delete the chat. I can find no other link, menu, or other tool with the Teams UI to delete the chat. 

I have deleted the local cache at %userprofile%\appdata\local\Packages\MSTeams_8wekyb3d8bbwe\LocalCache\Microsoft\MSTeams 

I have uninstalled and reinstalled the Teams application.

I have uninstalled using Revo Uninstaller and then reinstalled the Teams application.

In all instances, this group chat message remains.