External invited users not showing in participants screen

CNExpera Hello, can't say I understand your question really but will reply anyway. You're welcome to elaborate.

You can see the joined participants in the meeting itself by choosing 'Participants' from the menu bar. You can also find participant information before the meeting, who has accepted or not for ex, by simply opening the meeting invite in Teams. There's a list to the right. You can also use Outlook and the "tracking" feature in the calendar view to see this information. As long as the invitees has responded you'll at least know which participants to expect.