diff --git a/lib/sdk/oauth2-flows/AuthCodeAbstract.ts b/lib/sdk/oauth2-flows/AuthCodeAbstract.ts
index 54002d7..386811a 100644
--- a/lib/sdk/oauth2-flows/AuthCodeAbstract.ts
+++ b/lib/sdk/oauth2-flows/AuthCodeAbstract.ts
@@ -246,7 +246,7 @@ export abstract class AuthCodeAbstract {
     let scope = this.config.scope ?? AuthCodeAbstract.DEFAULT_TOKEN_SCOPES
     scope = scope.split(' ').includes('openid') ? scope : `${scope} openid`;
 
-    let searchParamsObject: Record<string, string> = {
+    let searchParamsObject: Record<string, unknown> = {
       scope,
     };
 
@@ -263,16 +263,26 @@ export abstract class AuthCodeAbstract {
       searchParamsObject.is_create_org = 'true';
     }
 
-    if (options.post_login_redirect_url) {
-      searchParamsObject.post_login_redirect_url = options.post_login_redirect_url;
-    }
-
     if (options.authUrlParams) {
-      searchParamsObject = { ...options.authUrlParams, ...searchParamsObject };
+      const { lang, login_hint: loginHint, connection_id: connectionId, ...rest } = options.authUrlParams;
+      searchParamsObject = { ...rest, ...searchParamsObject };
+      
+      if (lang) {
+        searchParamsObject.lang = lang;
+      }
+      
+      if (loginHint) {
+        searchParamsObject.login_hint = loginHint;
+      }
+      
+      if (connectionId) {
+        searchParamsObject.connection_id = connectionId;
+      }
     }
 
-    for (const key in searchParamsObject)
-      searchParams.append(key, searchParamsObject[key]);
+    for (const key in searchParamsObject) {
+      searchParams.append(key, String(searchParamsObject[key]!));
+    }
 
     if (this.config.audience) {
       const audienceArray = Array.isArray(this.config.audience) ? this.config.audience : [this.config.audience];