diff --git a/frontend/techpick/src/apis/apiClient.ts b/frontend/techpick/src/apis/apiClient.ts
index 2f2f21ba7..bc20d87a5 100644
--- a/frontend/techpick/src/apis/apiClient.ts
+++ b/frontend/techpick/src/apis/apiClient.ts
@@ -21,10 +21,12 @@ export const apiClient = ky.create({
           const parsedErrorMessage = error.message.split(' ');
           const errorCode = parsedErrorMessage.shift();
 
-          if (!errorCode) {
-            /* empty */
-          } else if (ERROR_MESSAGE_JSON[errorCode]) {
-            notifyError(ERROR_MESSAGE_JSON[errorCode]);
+          if (errorCode && ERROR_MESSAGE_JSON[errorCode]) {
+            if (errorCode === 'AU-001') {
+              window.location.href = '/login';
+            } else {
+              notifyError(ERROR_MESSAGE_JSON[errorCode]);
+            }
           }
         }
 
diff --git a/frontend/techpick/src/app/(unsigned)/login/failed/page.tsx b/frontend/techpick/src/app/(unsigned)/login/failed/page.tsx
index eba2d7d97..17c69dd4f 100644
--- a/frontend/techpick/src/app/(unsigned)/login/failed/page.tsx
+++ b/frontend/techpick/src/app/(unsigned)/login/failed/page.tsx
@@ -39,7 +39,7 @@ export default function LoginFailedPage() {
           <div className={googleLoginContainer}>
             <Link
               className={loginLink}
-              href={`${process.env.NEXT_PUBLIC_API}/login/google?redirectUrl=${redirectUrl}`}
+              href={`${process.env.NEXT_PUBLIC_API}/login/google?redirect_url=${redirectUrl}`}
             >
               <Image
                 style={{ filter: 'brightness(100)' }}
@@ -54,7 +54,7 @@ export default function LoginFailedPage() {
           <div className={kakaoLoginContainer}>
             <Link
               className={loginLink}
-              href={`${process.env.NEXT_PUBLIC_API}/login/kakao?redirectUrl=${redirectUrl}`}
+              href={`${process.env.NEXT_PUBLIC_API}/login/kakao?redirect_url=${redirectUrl}`}
             >
               <Image
                 style={{ filter: 'invert(100%)' }}
diff --git a/frontend/techpick/src/app/(unsigned)/login/page.tsx b/frontend/techpick/src/app/(unsigned)/login/page.tsx
index 2a1e44863..a7d858fd4 100644
--- a/frontend/techpick/src/app/(unsigned)/login/page.tsx
+++ b/frontend/techpick/src/app/(unsigned)/login/page.tsx
@@ -51,7 +51,7 @@ export default function LoginPage() {
           <div className={googleLoginContainer}>
             <Link
               className={loginLink}
-              href={`${process.env.NEXT_PUBLIC_API}/login/google?redirectUrl=${redirectUrl}`}
+              href={`${process.env.NEXT_PUBLIC_API}/login/google?redirect_url=${redirectUrl}`}
             >
               <Image
                 style={{ filter: 'brightness(100)' }}
@@ -66,7 +66,7 @@ export default function LoginPage() {
           <div className={kakaoLoginContainer}>
             <Link
               className={loginLink}
-              href={`${process.env.NEXT_PUBLIC_API}/login/kakao?redirectUrl=${redirectUrl}`}
+              href={`${process.env.NEXT_PUBLIC_API}/login/kakao?redirect_url=${redirectUrl}`}
             >
               <Image
                 style={{ filter: 'invert(100%)' }}
diff --git a/frontend/techpick/src/components/PickTagPicker/PickTagAutocompleteDialog.tsx b/frontend/techpick/src/components/PickTagPicker/PickTagAutocompleteDialog.tsx
index 0e65cedee..045b70f34 100644
--- a/frontend/techpick/src/components/PickTagPicker/PickTagAutocompleteDialog.tsx
+++ b/frontend/techpick/src/components/PickTagPicker/PickTagAutocompleteDialog.tsx
@@ -13,7 +13,7 @@ import {
   usePickStore,
   useUpdatePickStore,
 } from '@/stores';
-import { notifyError, numberToRandomColor } from '@/utils';
+import { numberToRandomColor } from '@/utils';
 import { DeleteTagDialog } from './DeleteTagDialog';
 import { DeselectTagButton } from './DeselectTagButton';
 import { SelectedTagItem } from '../SelectedTagItem';
@@ -100,10 +100,8 @@ export function PickTagAutocompleteDialog({
       });
       randomNumber.current = getRandomInt();
       onSelectTag(newTag!);
-    } catch (error) {
-      if (error instanceof Error) {
-        notifyError(error.message);
-      }
+    } catch {
+      /* empty */
     } finally {
       isCreateFetchPendingRef.current = false;
     }
diff --git a/frontend/techpick/src/components/PickTagPicker/TagInfoEditPopoverButton.tsx b/frontend/techpick/src/components/PickTagPicker/TagInfoEditPopoverButton.tsx
index 0a4719bd2..eebaee0e6 100644
--- a/frontend/techpick/src/components/PickTagPicker/TagInfoEditPopoverButton.tsx
+++ b/frontend/techpick/src/components/PickTagPicker/TagInfoEditPopoverButton.tsx
@@ -7,7 +7,7 @@ import DOMPurify from 'dompurify';
 import { EllipsisIcon } from 'lucide-react';
 import { useDisclosure } from '@/hooks';
 import { useTagStore } from '@/stores';
-import { notifyError, isEmptyString, isShallowEqualValue } from '@/utils';
+import { isEmptyString, isShallowEqualValue } from '@/utils';
 import { ShowDeleteTagDialogButton } from './ShowDeleteTagDialogButton';
 import {
   tagInfoEditFormLayout,
@@ -60,10 +60,8 @@ export function TagInfoEditPopoverButton({
         name: newTagName,
         colorNumber: tag.colorNumber,
       });
-    } catch (error) {
-      if (error instanceof Error) {
-        notifyError(error.message);
-      }
+    } catch {
+      /* empty */
     }
   };
 
diff --git a/frontend/techpick/src/constants/errorMessageJson.ts b/frontend/techpick/src/constants/errorMessageJson.ts
index e652d3f0e..a81519caa 100644
--- a/frontend/techpick/src/constants/errorMessageJson.ts
+++ b/frontend/techpick/src/constants/errorMessageJson.ts
@@ -1,4 +1,5 @@
 export const ERROR_MESSAGE_JSON: { [key: string]: string } = {
+  'AU-001': '로그인 정보가 확인되지 않았습니다.\n로그인 후 다시 시도해주세요.',
   'PK-000': '존재하지 않는 북마크입니다.',
   'PK-001': '이미 존재하는 북마크입니다! 북마크 저장을 실패했습니다!',
   'PK-002': '접근할 수 없는 북마크입니다.',
@@ -17,6 +18,7 @@ export const ERROR_MESSAGE_JSON: { [key: string]: string } = {
   'TG-001': '중복된 태그가 존재합니다.',
   'TG-002': '유효하지 않는 태그 이름입니다.',
   'TG-003': '잘못된 태그에 접근했습니다.',
+  'TG-005': '태그명이 허용된 최대길이를 초과했습니다.',
   'LI-000': '존재하지 않는 링크입니다.',
   'LI-002': '이미 존재하는 링크입니다.',
   'LI-003': '이 링크는 넣을 수 없습니다. ㅠㅠ',