Salesforce administrators can log in to a Salesforce org as another user to help troubleshoot issues that user is experiencing. This is known as "Login As" and requires the Modify All Data permission. Depending on the org's settings, the individual user may need to grant login access to the admin first.
Example use case: A Salesforce admin needs to reproduce an error that a sales rep is seeing on their screen. The admin logs in as that user to replicate the issue without requiring the user to be present.
To log in as another user in Salesforce:
Known limitations:
004333094

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