diff --git a/internal/publish/config.go b/internal/publish/config.go
index ebfad217a..189d3ca80 100644
--- a/internal/publish/config.go
+++ b/internal/publish/config.go
@@ -89,9 +89,6 @@ type Config struct {
 	// Should only be set if a server is being operated in a single region.
 	DefaultRegion string `env:"DEFAULT_REGION"`
 
-	// Feature flags - eventually these are removed as features become default behavior
-	FailOnCertificateAudienceMismatch bool `env:"FEATURE_FAIL_ON_CERTIFICATE_AUDIENCE_MISMATCH, default=true"`
-
 	// Flags for local development and testing. This will cause still valid keys
 	// to not be embargoed.
 	// Normally "still valid" keys can be accepted, but are embargoed.
diff --git a/internal/publish/publish.go b/internal/publish/publish.go
index 13897b801..1a0723bb3 100644
--- a/internal/publish/publish.go
+++ b/internal/publish/publish.go
@@ -286,7 +286,7 @@ func (h *PublishHandler) process(ctx context.Context, data *verifyapi.Publish, b
 	}
 
 	// Perform health authority certificate verification.
-	verifiedClaims, err := h.verifier.VerifyDiagnosisCertificate(ctx, appConfig, data, h.config.FailOnCertificateAudienceMismatch)
+	verifiedClaims, err := h.verifier.VerifyDiagnosisCertificate(ctx, appConfig, data)
 	if err != nil {
 		if appConfig.BypassHealthAuthorityVerification {
 			logger.Warnf("bypassing health authority certificate verification health authority: %v", appConfig.AppPackageName)
diff --git a/internal/verification/phaverify.go b/internal/verification/phaverify.go
index e38133883..16fe1f654 100644
--- a/internal/verification/phaverify.go
+++ b/internal/verification/phaverify.go
@@ -61,7 +61,7 @@ type VerifiedClaims struct {
 // VerifyDiagnosisCertificate accepts a publish request (from which is extracts the JWT),
 // fully verifies the JWT and signture against what the passed in authorrized app is allowed
 // to use. Returns any transmission risk overrides if they are present.
-func (v *Verifier) VerifyDiagnosisCertificate(ctx context.Context, authApp *aamodel.AuthorizedApp, publish *verifyapi.Publish, enforceAudienceMatch bool) (*VerifiedClaims, error) {
+func (v *Verifier) VerifyDiagnosisCertificate(ctx context.Context, authApp *aamodel.AuthorizedApp, publish *verifyapi.Publish) (*VerifiedClaims, error) {
 	logger := logging.FromContext(ctx)
 	// These get assigned during the ParseWithClaims closure.
 	var healthAuthorityID int64
@@ -110,12 +110,7 @@ func (v *Verifier) VerifyDiagnosisCertificate(ctx context.Context, authApp *aamo
 
 		// Advisory check the aud.
 		if claims.Audience != ha.Audience {
-			// TODO(mikehelmick) - clean up feature flag casing.
-			logger.Errorw("certifice audience mismatch - will be a failure in the next release", "claims.Aud", claims.Audience, "allowed", ha.Audience, "iss", ha.Issuer)
-			if enforceAudienceMatch {
-				// This flag guarding will be removed in a future release.
-				return nil, fmt.Errorf("audience mismatch for issuer: %v", ha.Issuer)
-			}
+			return nil, fmt.Errorf("audience mismatch for issuer: %v (+%q, -%q)", ha.Issuer, claims.Audience, ha.Audience)
 		}
 
 		// Find a key version.