Observed Signal · Jun 7, 2026 · Technical Release · Source: DEV Community · Impact: 2/5 · Sentiment: Neutral
Power Pages AI Skills: Local Auth Blocked by Private Portal
A developer tested Microsoft’s GA “AI skills for Power Pages” by scaffolding a Power Pages single-page app with GitHub Copilot–generated authentication code. The Copilot scaffold produced custom React login/registration flows, server-side form scraping for registration, a fallback calling /_services/auth/user (which returns an HTML portal shell with an embedded user object), and a Vite proxy that rewrites cookies and locations for localhost. During local development the site’s Power Pages visibility set to “Private” caused upstream Entra (login.microsoftonline.com) redirects with a production redirect_uri, blocking proxied requests. The fixes were: set the portal to Public and adjust the useAuth hook to derive authentication state from React user state after fetching the embedded user object. Publication date: 2026-06-07.
A Microsoft GA technical release shows strong developer automation via AI skills and exposes important local development/authentication caveats (Private vs Public site visibility). Relevant to developers and MarTech implementers, but not broadly industry-shifting for AdTech.
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Key Takeaways & Evidence Grounding
- Microsoft released the AI skills for building Power Pages portals to GA and the author used GitHub Copilot to scaffold a Power Pages SPA.
- The Copilot-generated auth stack used custom React forms, CSRF token fetching (/ _layout/tokenhtml), server-side form scraping for registration, and a fallback fetch to /_services/auth/user.
- /_services/auth/user returns a full HTML portal shell that embeds a JavaScript window.Microsoft.Dynamic365.Portal.User object rather than JSON; the author parsed HTML to extract the user.
- When a Power Pages site is set to “Private,” all local proxied requests receive a 302 redirect to login.microsoftonline.com with a redirect_uri pointing to the production portal, blocking local development; switching the site to “Public” fixed the network-level block.
- The Vite dev proxy was configured to strip Secure/Domain flags and rewrite SameSite and Location headers so session cookies from the portal are accepted on localhost.
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