Microsoft TEAMS - Privat

A personal Teams account is associated with your Microsoft Account. If you'd like to delete your Microsoft Account this is the official way https://support.microsoft.com/en-us/account-billing/how-to-close-your-microsoft-account-c1b2d13f-4de6-6e1b-4a31-d9d668849979

If you have created a so called Teams free organization with your personal Microsoft Account and you want to delete that this is the process https://support.microsoft.com/en-us/office/delete-your-teams-free-classic-organization-2c28cfcf-3fbf-497c-938f-8815a8f6a6b9