# Middleware error when deploying to Vercel

**URL:** <https://community.auth0.com/t/middleware-error-when-deploying-to-vercel/176243>\
**Category:** Get Help\
**Tags:** classic-universal-login-experience, login-experience\
**Created:** [January 30, 2025, 1:38pm UTC](https://community.auth0.com/t/middleware-error-when-deploying-to-vercel/176243 "2025-01-30T13:38:24Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![nik.baleca](https://sea1.discourse-cdn.com/auth0/user_avatar/community.auth0.com/nik.baleca/32/68749_2.png) [@nik.baleca](https://community.auth0.com/u/nik.baleca)\
**Post date:** [January 30, 2025, 7:12pm UTC](https://community.auth0.com/t/middleware-error-when-deploying-to-vercel/176243/3 "2025-01-30T19:12:59Z")

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Hi @dimitar10000

Thank you for posting your question on the Auth0 Community!

Regarding the **401 Unauthorized** that you receive for the profile, these could be possible causes for the issue:

- For the Auth0 Scopes, can you double check if you have them declared as `AUTH0_SCOPE= "openid email profile"` in Vercel? Changing it to `AUTH0_SCOPE=openid email profile` might do the trick since quotation marks might cause the error in the environment variables.
- I have checked your tenant and it appears that you have two similar applications, please double check if the **Client ID** and **Client Secret** are the correct ones.

For the **Invalid URL** error that you are receiving, please check if in your application’s settings you have the same URL that you are redirecting to in the **Allowed Callback URLs**. Please double check if all other URLs are matching as well.

For the Vercel 500 error, please review the following:

- Community post regarding [NextJS application not working on Vercel Cloud](https://community.auth0.com/t/auth0-nextjs-auth0-4-0-0-beta-8-next15-0-3-not-working-on-vercel-cloud/156307/4)
- DevHub post regarding [Deploying React App Secured By Auth0 to Vercel](https://community.auth0.com/t/how-to-deploy-a-react-app-secured-by-auth0-to-vercel/106408)
- Try to include www. in all the env variables and the callback URLs
- Community post regarding [Generic v4 Errors](https://community.auth0.com/t/trying-out-v4-beta-receiving-generic-error/151286/3). To save you time reading through the post, one of the users mentioned:

> I had issue with .env having https, once changed to without https. The login url started to work.
> 
> AUTH0\_DOMAIN=“.eu.auth0.com”
> 
> V3 supported https:// in AUTH0\_DOMAIN and it looks like it has been dropped in V4. Find it out by console logging middleware object and seeing double https in issuer

> It looks like the issue was that `AUTH0_DOMAIN` was set to localhost instead of the domain Auth0 provides for it’s identity service (the ENV variable that used to be `AUTH0_ISSUER_BASE_URL` ).

If you have any additional questions or if the proposed solutions above helped solve the issue, feel free to leave a reply on the post!

Kind Regard,  
Nik

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