Redirect URL for OAuth2 is missing in Spec!

Hello, 

I'm trying to login to SF API's with Oauth2 and get mismatch in redirect URL error

The spec:

components:
securitySchemes:
OAuth2:
type: oauth2
flows:
authorizationCode:
authorizationUrl: https://qa-x.cs82.force.com/services/oauth2/authorize
tokenUrl: https://qa-x.cs82.force.com/services/oauth2/token
scopes:
api: Grant access to API clients
web: Grant access to Web clients

Did anyone manage to fix the redirect URL issue? 
I've seen it in other thread without any valid solution

Thanks so much!!