Address PR feedback:

Updating the debug logging message
Modified the fallback logic in refresh credentials

Author: S-Saranya1

.changes/next-release/feature-AWSEC2-9b178a4.json

@@ -2,5 +2,5 @@
     "type": "feature",
     "category": "AWS SDK for Java v2",
     "contributor": "",
-    "description": "EC2 IMDS Changes to Support Account ID"
+    "description": "Include the account ID associated with the credentials retrieved from IMDS when available."
 }

core/auth/src/main/java/software/amazon/awssdk/auth/credentials/InstanceProfileCredentialsProvider.java

@@ -177,8 +177,8 @@ private RefreshResult<AwsCredentials> refreshCredentials() {
                                 .prefetchTime(prefetchTime(expiration))
                                 .build();
         } catch (Ec2MetadataClientException e) {
-            if (e.statusCode() == 404 && apiVersion.compareAndSet(ApiVersion.EXTENDED, ApiVersion.LEGACY)) {
-                log.debug(() -> "Unable to load credential path from extended API. Falling back to legacy API.");
+            if (e.statusCode() == 404) {
+                log.debug(() -> "Resolved profile is no longer available. Resetting it and trying again.");
                 resolvedProfile.set(null);
                 return refreshCredentials();
             }
@@ -338,7 +338,7 @@ private String[] getSecurityCredentials(String imdsHostname, String metadataToke
 
         } catch (Ec2MetadataClientException e) {
             if (e.statusCode() == 404 && apiVersion.compareAndSet(ApiVersion.UNKNOWN, ApiVersion.LEGACY)) {
-                log.debug(() -> "Unable to load credential path from extended API. Falling back to legacy API.");
+                log.debug(() -> "Instance does not support IMDS extended API. Falling back to legacy API.");
                 return getSecurityCredentials(imdsHostname, metadataToken);
             }
             throw SdkClientException.create("Failed to load credentials from IMDS.", e);