Is your feature request related to a problem? Please describe.
Yes, when I attempt to add authentik to an application I run or use, I'm frustrated when one of my inputted values are incorrect and I have to guess which one is wrong.

Describe the solution you'd like
authentik should tell the user what's wrong when an application/provider is created with the wizard
-> once the user clicks submit
-> or authentik should stop the user from clicking submit until errors are fixed

Describe alternatives you've considered
Looking in the console, finding the response with code 400, and expanding the json to find what's wrong

Additional context
The error authentik returns

What the server returns