If username.expression uses 'claims.email', then 'claims.email_verified' must be used in
  username.expression or extra[*].valueExpression or claimValidationRules[*].expression.
  An example claim validation rule expression that matches the validation automatically
  applied when username.claim is set to 'email' is 'claims.?email_verified.orValue(true) == true'. 

* OIDC authentication now allows tokens without an "email_verified" claim when using the "email" claim. If an "email_verified" claim is present when using the "email" claim, it must be `true`. ([#61508](https://github.com/kubernetes/kubernetes/pull/61508), [@rithujohn191](https://github.com/rithujohn191))

  
  If `username.expression` used 'claims.email', then 'claims.email_verified' must have been used in `username.expression` or `extra[*].valueExpression` or `claimValidationRules[*].expression`. An example claim validation rule expression that matches the validation automatically applied when `username.claim` is set to 'email' is 'claims.?email_verified.orValue(true) == true'.

* **When using OIDC authentication and specifying --oidc-username-claim=email, an `"email_verified":true` claim must be returned from the identity provider. ([#36087](https://github.com/kubernetes/kubernetes/pull/36087), [@ericchiang](https://github.com/ericchiang))**