Hi!
I encountered issues too this morning when trying to use Microsoft Teams connector 'list members' action with Azure Logic Apps (the same connector used in Power Automate). I'm able to input Thread Type 'channel' when connector prompts for both Team and Channel id like it should. However when running the Logic App the operation gives following error so it seems there are issues with GraphAPI permission which connector uses on background. In my case the channel i'm trying to list members from is a private channel but the account I use is a member of team and channel so it shouldn't be issue. This seems like a bug and/or really bad documentation and it really needs to fixed by Microsoft. In my case operation would be crucial for my solution.
The documentation is really narrow but it says the operation itself should be supported:
"This operation list members based on a threadtype (chat, channel, etc)."

Error:
{
"error": {
"code": "Forbidden",
"message": "Missing scope permissions on the request. API requires one of 'ChannelMember.Read.All, ChannelMember.ReadWrite.All, Group.Read.All, Directory.Read.All, Group.ReadWrite.All, Directory.ReadWrite.All'. Scopes on the request 'Calendars.ReadWrite, Calendars.ReadWrite.Shared, Channel.Create, Channel.ReadBasic.All, ChannelMessage.Read.All, ChannelMessage.ReadWrite, ChannelMessage.Send, Chat.Create, Chat.Read, Chat.ReadWrite, ChatMessage.Send, GroupMember.Read.All, Presence.Read.All, Presence.ReadWrite, Team.Create, Team.ReadBasic.All, TeamMember.ReadWrite.All, TeamsAppInstallation.ReadWriteForChat, TeamsAppInstallation.ReadWriteForTeam, TeamsAppInstallation.ReadWriteForUser, TeamSettings.Read.All, TeamSettings.ReadWrite.All, TeamworkTag.Read, TeamworkTag.ReadWrite, User.Read, User.Read.All'",
"innerError": {
"date": "2023-11-08T07:30:38",
"request-id": "f8b036fb-83a0-471c-ac6a-516a928265db",
"client-request-id": "f8b036fb-83a0-471c-ac6a-516a928265db"
}
}
}