Hotmail or Gmail guest not able to access the MS team web application

Hi, I try to invite hotmail or gmail (email) as guests for my MS team members. 

i use my hotmail account as test. 

i receive the invitation letter, and I am able to log in my hotmail account, how every I am not able to find 'Team app' or 'Sharepoint app'  in this hotmail account (it is free) show as follow:

according to this post, people may still access the MS teams even without office365 account. https://docs.microsoft.com/en-us/microsoftteams/guest-joins

but I am not able to access MS teams through my free hotmail account.

so, my question here is: 1. is free hotmail or gmail account without 365 still can participate in the MS team, chat and sharing files in a specific channel?

if so 2. in my case, how could i make that happen. ?

thank you!