What is your account type?
- Teams free personal account.
- Teams accounts for your organization.
If you're signed into a Teams free personal account, it's normal to have no Teams tab. However, you can use the same email address as a guest to join teams created on other organizations. For more details, you could refer to: https://support.microsoft.com/en-us/office/sign-up-for-teams-free-classic-70aaf044-b872-4c32-ac47-362ab29ebbb1.
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