Microsoft Teams company account annot login
Hi,
I can login to Teams using my personal email. However when I tried to use company email, it says
"You're missing out! Ask your admin to enable Microsoft Teams for xxx.com.
You're currently signed in as abc@X .com, select Sign up for Teams to continue, or use a different account."
The background is, another company with email domain "yyy.com" has Microsoft 365 license, and they opened an external account and granted Teams Guest Access for me, to connect with their internal users.
My own company domain is "xxx.com" and my company do not have any Microsoft license.
I can login to Microsoft 365, with two organizations to choose. One is yyy company and one is my own company domain.
Please let me know who should I contact in this case, yyy company IT or my own company IT? What is the issue about and how should I describe the issue to IT admin? Thanks very much.