The Your Account App is available for customers with standard Salesforce CRM licenses. System admins have “Your Account” access by default and can grant access permissions to other users in their org.
To resolve this, you will need to grant user access permissions. System admins can grant user access to the Your Account app in a few different ways:
Troubleshoot Access Issues:
This article is specifically about enabling access to "Your Account App"
For adding a new user to Salesforce in general, please refer to the Help doc below:
Add a Single User
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