A Workspace ONE UEM sandbox is a standard UEM tenant in a VMware Shared SaaS environment. To provide you initial access the UEM sandbox tenant, TestDrive set up a basic administrator account. In VMware Shared SaaS, a UEM basic administrator account is managed by the UEM environment itself and expires every 30 days (per VMware Cloud Operations policy).
If you need to reset a basic administrator account's password, use the UEM environment's "trouble logging in" feature.
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If the environment's built-in password reset feature presents an error or if you can't recall your password reset answers, contact support.