diff --git a/nucleus/payara-modules/nucleus-microprofile/config-service/src/main/java/fish/payara/nucleus/microprofile/config/spi/InjectedPayaraConfig.java b/nucleus/payara-modules/nucleus-microprofile/config-service/src/main/java/fish/payara/nucleus/microprofile/config/spi/InjectedPayaraConfig.java
index 8272e7e8cbb..8a3a1613660 100644
--- a/nucleus/payara-modules/nucleus-microprofile/config-service/src/main/java/fish/payara/nucleus/microprofile/config/spi/InjectedPayaraConfig.java
+++ b/nucleus/payara-modules/nucleus-microprofile/config-service/src/main/java/fish/payara/nucleus/microprofile/config/spi/InjectedPayaraConfig.java
@@ -71,7 +71,8 @@ public <T> Optional<T> getOptionalValue(String propertyName, Class<T> propertyTy
 
     @Override
     public Iterable<String> getPropertyNames() {
-        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
+        ensureDelegate();
+        return delegate.getPropertyNames();
     }
 
     @Override