Users who posted message in Teams Channel can edit the messages later but through the graph api there is no options to update messages or delete messages.
POST /teams/{id}/channels/{id}/messages/{id}/replies seems like we can reply to the message but not update the previous message sent. Here I am talking about the same user's credentials. In Teams, a user can edit but not using graph api

Please support getting MIME of a chat message just like we do for Mail Message.

https://docs.microsoft.com/en-us/graph/outlook-get-mime-message

We can assign users to shifts through Graph, but we can't assign users to Shifts Groups.
It is essential for us as an organization, that we can assign users to groups in a Shift. We can add them to the TEAM, but from there, they can't take shifts in the groups.

We can get assigned Shifts through Graph (and Power Automate / Flow). But we can't get open shifts. It is essential for us as an organization, that we can run through open shifts and offering them to users.

Currently, the only way to send messages is to post a message on a channel in a team. It would be great if there could be an API to send a direct message to the users. Please let me know if it already exists, because I could not find any such method in the chat object here :
https://docs.microsoft.com/en-us/graph/api/resources/teams-api-overview?view=graph-rest-beta

Do not deprecate Application Permissions ability to generate Teams Meetings. This is a valuable function that is used to quickly generate a collaborative meeting for our IT teams to discuss major incidents or outages. Current delegated permissions flows do not allow us to do this in the same manner and will lead to us losing this functionality

I want the feature to get a list of chats with application permission. For developing a custom application for the eDiscovery/litigation purpose, administrator need application permission to get a list of chats.

According to https://docs.microsoft.com/en-us/graph/api/resources/teamsapp?view=graph-rest-beta, only delegated permission is supported to manipulate Teams AppCatalog which means a sign-in user is needed when taking use of those APIs. However, the Application permission can provide the ability to make related actions more automatically and support more meaningful and realistic use-cases.

For example, my use-case is to provided an application to automatically install a new Bot, created in Azure, to Teams. So I really think the Application permission is needed.

In the current graph beta, user chats and their messages can be enumerated using GET /users/{id}/chats and GET /users/{id}/chats/{id}/messages. However, new messages cannot be posted to the messages endpoint i.e POST /users/{id}/chats/{id}/messages . Please add this functionality.

The desired functionality exists for team channel messages by posting to the channel messages endpoint (POST /teams/{id}/channels/{id}/messages). Replicating this for user chats using the same json payload would seem to be the most appropriate solution.

We have integrated the teams meeting on our client code but then we where asked for handling 2000 users on the specific implementation which is not posible for teams normal meeting limitations it would be amazing to have an endpoint for create live events in order to handle this .

With the announcement at Ignite 2019 of Pinned Channels it would be great if we could get access to them via the Graph API. You could add a property to the Channel called 'isPinned' and/or make a call to get all pinned channels in one hit e.g. me/pinnedChannels

support delete message and edit message.

Please provide the ability to set channel moderation settings via the Graph API. We have an automated process to set up channels for incident resolution but users have to manually set the moderation settings which is inconvenient and cumbersome and error prone. Would be great to be able to turn this on and add moderators via the API

At the moment, only archive teams are there. In some cases, the teams is still active but some channels within that teams is inactive. Requesting an API to archive/hide/show inactive channels.

After I create a private channel with Graph Beta I had to manually click on the Files tab for the Team clients to create the SharePoint site. I would like to Graph Create Channel API to create the underlying SharePoint site as well.