I face “Due to an unexpected technical problem..” error page

Shopify Discussion
1

I am working on Shopify OAuth with a Shopify Partners account.
I was able to set up the redirect URI, but whenever I click it, I get

**Due to an unexpected technical problem, Shopify is temporarily unavailable. Please check back in a few minutes – we’ll be up and running in no time!
**
I followed common approaches like the ones below, but they didn’t work.
Actually, the Shopify help desk only gave me this answer.
Check Shopify Status: Visit the Shopify Status page to see if there are any ongoing issues affecting Shopify services. - no problem all the time
Clear Browser Cache
Try a Different Browser or Device
Check Internet Connection

Looking forward to your reply. Thanks a lot!

2

This usually occurs if the redirect URI provided does not exactly match the one that was registered in the app’s settings Make sure that you are using HTTPS and that query parameters are properly specified Double check that your app’s callback route is handling the Authorization Code correctly For local development, try using a tunnel such as Ngrok to resolve OAuth issues