Addressed review comments

Author: pmathew92

auth0/src/main/java/com/auth0/android/authentication/storage/BaseCredentialsManager.kt

@@ -170,15 +170,21 @@ public abstract class BaseCredentialsManager internal constructor(
     protected fun saveDPoPThumbprint(credentials: Credentials) {
         val dpopUsed = credentials.type.equals("DPoP", ignoreCase = true)
             || authenticationClient.isDPoPEnabled
-        if (dpopUsed && DPoPUtil.hasKeyPair()) {
-            try {
-                val thumbprint = DPoPUtil.getPublicKeyJWK()
-                if (thumbprint != null) {
-                    storage.store(KEY_DPOP_THUMBPRINT, thumbprint)
-                }
-            } catch (e: DPoPException) {
-                Log.w(this::class.java.simpleName, "Failed to store DPoP key thumbprint", e)
-            }
+
+        if (!dpopUsed) {
+            storage.remove(KEY_DPOP_THUMBPRINT)
+            return
+        }
+
+        val thumbprint = try {
+            if (DPoPUtil.hasKeyPair()) DPoPUtil.getPublicKeyJWK() else null
+        } catch (e: DPoPException) {
+            Log.w(this::class.java.simpleName, "Failed to fetch DPoP key thumbprint", e)
+            null
+        }
+
+        if (thumbprint != null) {
+            storage.store(KEY_DPOP_THUMBPRINT, thumbprint)
         } else {
             storage.remove(KEY_DPOP_THUMBPRINT)
         }

auth0/src/main/java/com/auth0/android/authentication/storage/CredentialsManagerException.kt

@@ -215,7 +215,7 @@ public class CredentialsManagerException :
                 Code.SSO_EXCHANGE_FAILED ->"The exchange of the refresh token for SSO credentials failed."
                 Code.MFA_REQUIRED -> "Multi-factor authentication is required to complete the credential renewal."
                 Code.DPOP_KEY_MISSING -> "The stored credentials are DPoP-bound but the DPoP key pair is no longer available in the Android KeyStore. Re-authentication is required."
-                Code.DPOP_NOT_CONFIGURED -> "The stored credentials are DPoP-bound but the AuthenticationAPIClient used by this CredentialsManager was not configured with useDPoP(context). Call AuthenticationAPIClient(auth0).useDPoP(context) and pass the configured client to CredentialsManager."
+                Code.DPOP_NOT_CONFIGURED -> "The stored credentials are DPoP-bound but the AuthenticationAPIClient used by this credentials manager was not configured with useDPoP(context). Call AuthenticationAPIClient(auth0).useDPoP(context) and pass the configured client to the credentials manager."
                 Code.UNKNOWN_ERROR -> "An unknown error has occurred while fetching the token. Please check the error cause for more details."
             }
         }