Microsoft Teams

I assume that you want to select chat id. If you just click on the cell and than click on OK. it will be selected for you.

How du I extend this list?
Is there every succesfull connection?I'm confused right now.

 

I am also confused

The screenshot provided shows two rows (chats). 
Do you mean that you expect more than 2 rows?

How do I extend this list?

I also want to send a message to this 19:4b89a773-30d0-4dd8-b990-283b1bb78658_92fde89f-3b0a-495f-b60f-178604c0cdf0@unq.gbl.spaces ID

At all depends on authorization

I am using test account here "etltest"

"etltest" can only see the chats "etltest" sent messages to or received messages from.

Say for example "etltest" has never chatted with John Smith

Once "etltest" sent chat message to John Smith (From Teams Manually) the new chat will be seen in the chat selection dialogue.

Are you using  etltest account or your own account? 

Where did you get this chat id form?

I also want to send a message to this 19:4b89a773-30d0-4dd8-b990-283b1bb78658_92fde89f-3b0a-495f-b60f-178604c0cdf0@unq.gbl.spaces ID.

PS: we've spent whole day trying to figure out why the chat list is empty. It only started to work once we actually send a message using teams.


 

Good morning, Mike
Sorry for my stupidity yesterday.

Now I understand the system.
It shows all existing connections in the chat.

First, start a chat manually in Messenger.
Then it shows the connection to select.

Then, voilà, it works!

Thomas