These tools are surprisingly powerful. The tools appear right next to the rendered webpage in the browser.
Suppose you are trying to log in to a service called "Microsoft New Service" but it doesn't work. The tab text says "Sign in to Microsoft New Service". Open up Dev Tools. Click on Network (the wifi-style icon).
Now reload the webpage.
You will see entire flow of HTTP requests and responses. A 200 response is status code OK, a 204 means No Content. In fact, any status code between 200 and 299 is a form of success. 300-399 are redirection messages, and anything about that represents an error.
You may be surprised by the number of conditional access-related HTTP requests that are involved in an authentication attempt.
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