A list of considerations for changing site hostname is probably a good idea!
Off the top of my head:
- things fixable with a host redirect:
- inbound links
- one-time login links
- links in emails
- search engine indexes
- things that will or probably will need reconfiguration:
- federated logins
- SSO
- TLS cert
- container definition
- things that will unconditionally break:
- U2F tokens
- Passkeys
- existing login sessions