Using Microsoft Teams on macOS, including installation, features, and compatibility
According to the official documentation, Teams application is no longer supported on Mac OS Ventura:
https://learn.microsoft.com/en-us/microsoftteams/teams-client-system-requirements
Teams app is supported on the three most recent versions of macOS. Currently, the three most recent versions of Mac OS are
macOS Tahoe 26.2
macOS Sequoia 15.7.3
macOS Sonoma 14.8.3
https://support.apple.com/en-us/109033
If you cannot update your Mac OS, then you can try to open Teams for Web app in your browser.