diff --git a/.changeset/strange-foxes-invent.md b/.changeset/strange-foxes-invent.md
new file mode 100644
index 00000000000..532c354c3c6
--- /dev/null
+++ b/.changeset/strange-foxes-invent.md
@@ -0,0 +1,5 @@
+---
+"@wso2is/identity-apps-core": patch
+---
+
+Update the ui_locales resolving logic
diff --git a/identity-apps-core/apps/authentication-portal/src/main/webapp/includes/branding-preferences.jsp b/identity-apps-core/apps/authentication-portal/src/main/webapp/includes/branding-preferences.jsp
index 2863de919a6..45b75e90c75 100644
--- a/identity-apps-core/apps/authentication-portal/src/main/webapp/includes/branding-preferences.jsp
+++ b/identity-apps-core/apps/authentication-portal/src/main/webapp/includes/branding-preferences.jsp
@@ -66,8 +66,17 @@
         if (localeFromCookie != null) {
             lang = localeFromCookie;
             try {
-                String langStr = lang.split("_")[0];
-                String langLocale = lang.split("_")[1];
+                String langStr = "en";
+                String langLocale = "US";
+
+                if (lang.contains("_")) {
+                    langStr = lang.split("_")[0];
+                    langLocale = lang.split("_")[1];
+                } else if (lang.contains("-")) {
+                    langStr = lang.split("-")[0];
+                    langLocale = lang.split("-")[1];
+                }
+
                 userLocale = new Locale(langStr, langLocale);
             } catch (Exception e) {
                 // In case the language is defined but not in the correct format
@@ -75,8 +84,17 @@
             }
         } else if (uiLocaleFromURL != null) {
             for (String localeStr : uiLocaleFromURL.split(" ")) {
-                String langStr = localeStr.split("_")[0];
-                String langLocale = localeStr.split("_")[1];
+                String langStr = "en";
+                String langLocale = "US";
+
+                if (lang.contains("_")) {
+                    langStr = lang.split("_")[0];
+                    langLocale = lang.split("_")[1];
+                } else if (lang.contains("-")) {
+                    langStr = lang.split("-")[0];
+                    langLocale = lang.split("-")[1];
+                }
+                
                 Locale tempLocale = new Locale(langStr, langLocale);
                 // Trying to find out whether we have a resource bundle for the given locale
                 try {
diff --git a/identity-apps-core/apps/authentication-portal/src/main/webapp/includes/localize.jsp b/identity-apps-core/apps/authentication-portal/src/main/webapp/includes/localize.jsp
index 56a7e3187c9..850b1432a09 100644
--- a/identity-apps-core/apps/authentication-portal/src/main/webapp/includes/localize.jsp
+++ b/identity-apps-core/apps/authentication-portal/src/main/webapp/includes/localize.jsp
@@ -49,8 +49,16 @@
         lang = localeFromCookie;
 
         try {
-            String langStr = lang.split("_")[0];
-            String langLocale = lang.split("_")[1];
+            String langStr = "en";
+            String langLocale = "US";
+
+            if (lang.contains("_")) {
+                langStr = lang.split("_")[0];
+                langLocale = lang.split("_")[1];
+            } else if (lang.contains("-")) {
+                langStr = lang.split("-")[0];
+                langLocale = lang.split("-")[1];
+            }
 
             userLocale = new Locale(langStr, langLocale);
         } catch (Exception e) {
@@ -59,8 +67,16 @@
         }
     } else if (uiLocaleFromURL != null) {
         for (String localeStr : uiLocaleFromURL.split(" ")) {
-            String langStr = localeStr.split("_")[0];
-            String langLocale = localeStr.split("_")[1];
+            String langStr = "en";
+            String langLocale = "US";
+
+            if (localeStr.contains("_")) {
+                langStr = localeStr.split("_")[0];
+                langLocale = localeStr.split("_")[1];
+            } else if (localeStr.contains("-")) {
+                langStr = localeStr.split("-")[0];
+                langLocale = localeStr.split("-")[1];
+            }
 
             Locale tempLocale = new Locale(langStr, langLocale);
 
diff --git a/identity-apps-core/apps/recovery-portal/src/main/webapp/includes/branding-preferences.jsp b/identity-apps-core/apps/recovery-portal/src/main/webapp/includes/branding-preferences.jsp
index 54142a74b66..c4ed1addb38 100644
--- a/identity-apps-core/apps/recovery-portal/src/main/webapp/includes/branding-preferences.jsp
+++ b/identity-apps-core/apps/recovery-portal/src/main/webapp/includes/branding-preferences.jsp
@@ -66,8 +66,17 @@
         if (localeFromCookie != null) {
             lang = localeFromCookie;
             try {
-                String langStr = lang.split("_")[0];
-                String langLocale = lang.split("_")[1];
+                String langStr = "en";
+                String langLocale = "US";
+
+                if (lang.contains("_")) {
+                    langStr = lang.split("_")[0];
+                    langLocale = lang.split("_")[1];
+                } else if (lang.contains("-")) {
+                    langStr = lang.split("-")[0];
+                    langLocale = lang.split("-")[1];
+                }
+
                 userLocale = new Locale(langStr, langLocale);
             } catch (Exception e) {
                 // In case the language is defined but not in the correct format
@@ -75,8 +84,17 @@
             }
         } else if (uiLocaleFromURL != null) {
             for (String localeStr : uiLocaleFromURL.split(" ")) {
-                String langStr = localeStr.split("_")[0];
-                String langLocale = localeStr.split("_")[1];
+                String langStr = "en";
+                String langLocale = "US";
+
+                if (localeStr.contains("_")) {
+                    langStr = localeStr.split("_")[0];
+                    langLocale = localeStr.split("_")[1];
+                } else if (localeStr.contains("-")) {
+                    langStr = localeStr.split("-")[0];
+                    langLocale = localeStr.split("-")[1];
+                }
+
                 Locale tempLocale = new Locale(langStr, langLocale);
                 // Trying to find out whether we have a resource bundle for the given locale
                 try {