After April 12, 2023, Microsoft Teams Free (classic), the legacy free Teams app for business, will no longer be available. You could upgrade from Microsoft Teams Free (classic) to Microsoft Teams (free). The new Microsoft Teams (free) app lets you chat, schedule meetings, and so much more. Some features require a Microsoft subscription to unlock even more capabilities and remove limits. For example, meetings are capped to 60 minutes without a subscription but extended to 30 hours when you get a subscription.
After the switch, you’ll have access to a different set of features than you did with Teams Free (classic), and your data won’t be retained (including data for existing channels, chats, and recurring meetings). If you want to keep your data and continue using Teams, consider upgrading to Teams Essentials.
For more details, you may refer to the article.
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