Thanks for your reply. That's very helpful.
My initial thought is to create a token from my companies web page and having users access the Totara based on that link from my companies page and sending the token over.
I do this now with a couple of my sites, but I share a preshared secret key when creating the token, and that shared key will need to be known on the Tortara end, perhaps by a LMS Host that uses Totara.
Thanks again for your response, I will check out MS Teams which we do use a lot.