Having problems logging in to your dev, personal, or scratch org to verify the completion of a 500 point Trailhead lesson? Personal dev orgs are Production orgs and use login.salesforce.com and dev sandboxes are sandboxes and use test.salesforce.com and since I usually just use the CLI to log in to scratch orgs I can never remember which to use. And I don’t need to. There is enough to remember about Salesforce and technology in general, so if I can simplify something to a common approach, I always do. In this case, when authoring an org of an OAuth connection I always use the Use Custom Domain option and paste in the domain of the org I want to use.
© Scott S. Nelson