This makes no sense
4 - In the Redirect URI section, select Web and enter the URL https://contoso5.portal.azure-api.net/signin.
What is the URL supposed to be? No detail here
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@mcalnd70 Thank you for your feedback. This appears to be doc-bug so I'll create a PR that'll address it. The correct guidance for the Redirect URI is communicated at steps 14 through 17 of the Enable OAuth 2.0 user authorization in the Developer Console section.
Thanks - I would suggest that step 16 be re-worded also to..
16 - Go back to your client-app registration in Azure Active Directory and select Authentication.
There is a lot of throwing items backwards and forwards into different elements in different places, so needs to be clearer to assist the cause.
@neilmcalister Thanks again for raising this issue and helping us drive improvements toward MS Docs! I've created a PR, which includes your suggestion above, that corrects the faulty steps. The changes should be live within the next 24hrs.
We will now proceed to close this thread. If there are further questions regarding this matter, please reopen it and we will gladly continue the discussion.