Microsoft Team queries

Hello Out There,

I am not a IT person. 

Recently i set up a MS Team free account using my individual corporate email and created our "Organisation" team. Thereafter, i invited all my other colleagues within my Company to join the MS Team free "Organisation" team. 

We are intending to use the MS Teams free to create meeting chatrooms with our clients etc. 

Question:

1. In the settings, there was no "Team Code" option for me to share with other people. Tried abit by navigating through the Azure Portal but still have no clues what needs to be done. 

2. Our Company had subscribed to a one-drive account and has an admin account of its own, i tried to invite this admin account to the "Organisation" but it didn't worked out. No idea how does it works.

Thank you in advance for the responses!