When creating a new Salesforce sandbox and restricting access using a public group, users in roles that are referenced by the group may be automatically frozen in the sandbox. This occurs because role-based public groups include all subordinate users in that role hierarchy, and the sandbox activation process freezes users not explicitly included in the access group.
This is the expected behavior as described in the Salesforce Help documentation. To prevent this, ensure that you set the public group for sandbox access to the User type.
Note: Make sure all members of the group are of type Users.
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