How to fix ‘http://localhost:4200’ is not a valid redirect URI’ under default redirect ?
Please give us more information so we know what you’re trying to do. I’m guessing you’re trying to create an Angular app that works with Okta? You can do this in a couple of minutes if you use the Okta CLI and run okta start angular. Here’s a blog post / video that demonstrates how it works.
Can you try adding http://localhost:4200 to your Trusted Domains for Redirects (see steps for enabling CORS and Redirects for your domain here) and re-test?