Why is this needed:

For high skilled people, the current behavior is enough to understand what to do, but for my hundreds of business people, they open an IT ticket instead of requesting access on the tooling to request access.

What would you like to be added:
A way to customize the following error: "login provider denied login request"

Who is this feature for?

Server Administrators with Oauth Provider where Oauth Provider does Authentication AND Authorization before redirecting to Grafana