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Microsoft Entra app

slotmirror needs an app registration in Microsoft Entra to connect Microsoft 365 and Outlook.com accounts.

  1. In the Microsoft Entra admin center, open App registrations and choose New registration.
  2. Supported account types: Accounts in any organizational directory and personal Microsoft accounts. Choose a single tenant only if every calendar is in your tenant.
  3. Redirect URI: platform Web, https://<your-worker>/auth/microsoft/callback.
  4. Under API permissions, add the delegated Microsoft Graph permissions openid, email, profile, offline_access, User.Read and Calendars.ReadWrite. Users can consent to these themselves, unless your tenant blocks user consent.
  5. Under Certificates & secrets, create a client secret. Note when it expires. The sync stops when it expires.
  6. Set MICROSOFT_CLIENT_ID (the application ID) and MICROSOFT_CLIENT_SECRET:
Terminal window
pnpm wrangler secret put MICROSOFT_CLIENT_ID
pnpm wrangler secret put MICROSOFT_CLIENT_SECRET

For a team on Microsoft 365, also see Organisations: it explains ALLOWED_TENANT_IDS, SIGN_IN_PROVIDERS and SCIM.