We’re moving customers with My Domains and Custom Domains to Salesforce Edge. The Domains
Setup page now shows more details, and new session-security-level policies control access to certain
Setup pages and objects. TLS 1.2 is required for all HTTPS connections, and instance names are
scheduled to be removed from My Domain sandbox URLs
https://help.salesforce.com/s/articleView?id=release-notes.rn_security_other_changes.htm&release=222&type=5