Hi @3769863
After April 12, 2023, Microsoft is retiring Microsoft Teams Free (classic), the legacy free Teams app for business. Microsoft is making this change to invest in a single free Teams experience across personal and small business. For over a year, Microsoft has only allowed new customers to sign up for the new Microsoft Teams (free).
If you want to keep your data and continue using Teams, you can upgrade your users to a paid Teams license.
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