Remove the Manage Encryption Keys Permission from the System Admin Profile (Previously Released Critical Update)
Where: This change applies to Lightning Experience and Salesforce Classic in Enterprise, Performance, Unlimited, and Developer editions.
When: This critical update is automatically activated in Spring ’29.
Who: This critical update applies to customers who enabled Shield Platform Encryption before the Spring ’16 release. Customers who enabled Shield Platform Encryption after the Spring ’16 release are unaffected by this critical update.