diff --git a/nestjs-BE/server/src/invite-codes/invite-codes.controller.ts b/nestjs-BE/server/src/invite-codes/invite-codes.controller.ts
index 312572c2..a0796bcc 100644
--- a/nestjs-BE/server/src/invite-codes/invite-codes.controller.ts
+++ b/nestjs-BE/server/src/invite-codes/invite-codes.controller.ts
@@ -30,6 +30,10 @@ export class InviteCodesController {
     status: HttpStatus.BAD_REQUEST,
     description: 'Space code input is missing.',
   })
+  @ApiResponse({
+    status: HttpStatus.UNAUTHORIZED,
+    description: 'need access token',
+  })
   @ApiResponse({
     status: HttpStatus.NOT_FOUND,
     description: 'Space not found.',
@@ -50,6 +54,10 @@ export class InviteCodesController {
     status: HttpStatus.OK,
     description: 'Returns a space associated with the invite code.',
   })
+  @ApiResponse({
+    status: HttpStatus.UNAUTHORIZED,
+    description: 'need access token',
+  })
   @ApiResponse({
     status: HttpStatus.NOT_FOUND,
     description: 'Invite code not found.',
diff --git a/nestjs-BE/server/src/invite-codes/invite-codes.service.spec.ts b/nestjs-BE/server/src/invite-codes/invite-codes.service.spec.ts
index 026f8a99..e6735dd7 100644
--- a/nestjs-BE/server/src/invite-codes/invite-codes.service.spec.ts
+++ b/nestjs-BE/server/src/invite-codes/invite-codes.service.spec.ts
@@ -87,10 +87,6 @@ describe('InviteCodesService', () => {
     const testInviteCode = { inviteCode: 'test invite code' } as InviteCode;
 
     beforeEach(() => {
-      (prisma.$transaction as jest.Mock) = jest.fn(async (callback) =>
-        callback(),
-      );
-      jest.spyOn(inviteCodesService, 'findInviteCode').mockResolvedValue(null);
       (prisma.inviteCode.create as jest.Mock) = jest.fn(
         async () => testInviteCode,
       );
@@ -100,7 +96,7 @@ describe('InviteCodesService', () => {
       const inviteCode = inviteCodesService.createInviteCode(testSpaceUuid);
 
       await expect(inviteCode).resolves.toEqual(testInviteCode);
-      expect(inviteCodesService.findInviteCode).toHaveBeenCalledTimes(1);
+      expect(prisma.inviteCode.create).toHaveBeenCalledTimes(1);
     });
   });
 });
diff --git a/nestjs-BE/server/src/invite-codes/invite-codes.service.ts b/nestjs-BE/server/src/invite-codes/invite-codes.service.ts
index b55c9082..8c34e949 100644
--- a/nestjs-BE/server/src/invite-codes/invite-codes.service.ts
+++ b/nestjs-BE/server/src/invite-codes/invite-codes.service.ts
@@ -35,22 +35,25 @@ export class InviteCodesService {
   }
 
   async createInviteCode(spaceUuid: string): Promise<InviteCode> {
-    return this.prisma.$transaction(async () => {
-      let inviteCode: string;
+    let inviteCode: InviteCode;
+    const newUuid = uuid();
 
-      do {
-        inviteCode = generateRandomString(INVITE_CODE_LENGTH);
-      } while (await this.findInviteCode(inviteCode));
+    do {
+      try {
+        inviteCode = await this.prisma.inviteCode.create({
+          data: {
+            uuid: newUuid,
+            inviteCode: generateRandomString(INVITE_CODE_LENGTH),
+            spaceUuid,
+            expiryDate: getExpiryDate({ hour: INVITE_CODE_EXPIRY_HOURS }),
+          },
+        });
+      } catch (err) {
+        if (err.code !== 'P2002') throw err;
+      }
+    } while (!inviteCode);
 
-      return this.prisma.inviteCode.create({
-        data: {
-          uuid: uuid(),
-          inviteCode,
-          spaceUuid,
-          expiryDate: getExpiryDate({ hour: INVITE_CODE_EXPIRY_HOURS }),
-        },
-      });
-    });
+    return inviteCode;
   }
 
   @Cron(CronExpression.EVERY_HOUR)