diff --git a/api/src/main/java/io/kafbat/ui/service/rbac/extractor/OauthAuthorityExtractor.java b/api/src/main/java/io/kafbat/ui/service/rbac/extractor/OauthAuthorityExtractor.java
index ec9dd9c1f..a4458e64b 100644
--- a/api/src/main/java/io/kafbat/ui/service/rbac/extractor/OauthAuthorityExtractor.java
+++ b/api/src/main/java/io/kafbat/ui/service/rbac/extractor/OauthAuthorityExtractor.java
@@ -26,19 +26,7 @@ public class OauthAuthorityExtractor implements ProviderAuthorityExtractor {
 
   @Override
   public boolean isApplicable(String provider, Map<String, String> customParams) {
-    var typeMatch = OAUTH.equalsIgnoreCase(provider) || OAUTH.equalsIgnoreCase(customParams.get(TYPE));
-
-    if (!typeMatch) {
-      return false;
-    }
-
-    var containsRolesFieldNameParam = customParams.containsKey(ROLES_FIELD_PARAM_NAME);
-    if (!containsRolesFieldNameParam) {
-      log.debug("Provider [{}] doesn't contain a roles field param name, mapping won't be performed", provider);
-      return false;
-    }
-
-    return true;
+    return OAUTH.equalsIgnoreCase(provider) || OAUTH.equalsIgnoreCase(customParams.get(TYPE));
   }
 
   @Override
@@ -60,15 +48,25 @@ public Mono<Set<String>> extract(AccessControlService acs, Object value, Map<Str
   }
 
   private Set<String> extractUsernameRoles(AccessControlService acs, DefaultOAuth2User principal) {
-    return acs.getRoles()
+    var principalName = principal.getName();
+
+    log.debug("Principal name is: [{}]", principalName);
+
+    var roles = acs.getRoles()
         .stream()
         .filter(r -> r.getSubjects()
             .stream()
             .filter(s -> s.getProvider().equals(Provider.OAUTH))
             .filter(s -> s.getType().equals("user"))
-            .anyMatch(s -> s.getValue().equals(principal.getName())))
+            .peek(s -> log.trace("[{}] matches [{}]? [{}]", s.getValue(), principalName,
+                s.getValue().equalsIgnoreCase(principalName)))
+            .anyMatch(s -> s.getValue().equalsIgnoreCase(principalName)))
         .map(Role::getName)
         .collect(Collectors.toSet());
+
+    log.debug("Matched roles by username: [{}]", String.join(", ", roles));
+
+    return roles;
   }
 
   private Set<String> extractRoles(AccessControlService acs, DefaultOAuth2User principal,
@@ -77,7 +75,17 @@ private Set<String> extractRoles(AccessControlService acs, DefaultOAuth2User pri
     Assert.notNull(provider, "provider is null");
     var rolesFieldName = provider.getCustomParams().get(ROLES_FIELD_PARAM_NAME);
 
+    if (rolesFieldName == null) {
+      log.warn("Provider [{}] doesn't contain a roles field param name, won't map roles", provider);
+      return Collections.emptySet();
+    }
+
     var principalRoles = convertRoles(principal.getAttribute(rolesFieldName));
+    if (principalRoles.isEmpty()) {
+      log.debug("Principal [{}] doesn't have any roles, nothing to do", principal.getName());
+      return Collections.emptySet();
+    }
+
     log.debug("Token's groups: [{}]", String.join(",", principalRoles));
 
     Set<String> roles = acs.getRoles()
@@ -94,7 +102,7 @@ private Set<String> extractRoles(AccessControlService acs, DefaultOAuth2User pri
         .map(Role::getName)
         .collect(Collectors.toSet());
 
-    log.debug("Matched roles: [{}]", String.join(", ", roles));
+    log.debug("Matched group roles: [{}]", String.join(", ", roles));
 
     return roles;
   }
@@ -102,7 +110,7 @@ private Set<String> extractRoles(AccessControlService acs, DefaultOAuth2User pri
   @SuppressWarnings("unchecked")
   private Collection<String> convertRoles(Object roles) {
     if (roles == null) {
-      log.debug("Param missing from attributes, skipping");
+      log.warn("Param missing in attributes, nothing to do");
       return Collections.emptySet();
     }
 
@@ -112,7 +120,7 @@ private Collection<String> convertRoles(Object roles) {
     }
 
     if (!(roles instanceof String)) {
-      log.debug("The field is not a string, skipping");
+      log.trace("The field is not a string, skipping");
       return Collections.emptySet();
     }