Okta callback path on Azure WebApp returns 404

[dino_ben]

I’m building an app that uses Okta login with OpenId and uses the ASP Core 3.1 SDK to set up everything.
I have used the following resources to create the app and upload it to Azure WebApp:
https://developer.okta.com/blog/2020/12/09/dotnet-cloud-host-publish
https://developer.okta.com/docs/guides/sign-into-web-app/aspnetcore3/before-you-begin/
https://github.com/okta/samples-aspnetcore/tree/master/samples-aspnetcore-3x/okta-hosted-login

When I run the app on localhost everything works fine but when I upload it to Azure after I sign in with the hosted sign-in form I’m getting a 404 page on the callback route (/authorization-code/callback).
Have anyone encountered this issue before and knows what am I missing or if this is a known issue?

[tyty]

Interesting, can you confirm you have the redirect uri defined in the application settings in Okta?

[dino_ben]

I am using the default settings so the redirect URI is not defined at all.

[dino_ben]

So in the end the issue was that there was an exception in the OnTokenValidated event due to our code and that’s why it showed the callback URL as a 404 page