OS X Yosemite to use MS team

Hi All,

I need to use MS team for meeting and I downloaded the MS team on MacBook Air.

I'm using OS X Yosemite 10.10.5 version. Unfortunately, I cannot use it because it showed I have to upgrade the OS X 10.11 or later version.

Do i have to upgrade the version?

Could I use MS Team without upgrade version? It is urgert meeting.

Could please to advice the quicker way to solve the issue.

Thank you.

SugarJen