message: mention connectivity to graph.microsoft.com
  Recently I was helping somebody with a Backstage installation who was hitting
  this error, and it turned out they needed a firewall rule to allow this
  connectivity.
diff: @@ -46,6 +46,12 @@ The Microsoft provider is a structure with three configuration keys:
  - `clientSecret`: Secret, found on App Registration > Certificates & secrets
  - `tenantId`: Directory (tenant) ID, found on App Registration > Overview
  +In order to finish signing a user in from Azure, the Backstage backend must
  +fetch their information from graph.microsoft.com (as seen in [this source
  +code](https://github.com/seanfisher/passport-microsoft/blob/0456aa9bce05579c18e77f51330176eb26373658/lib/strategy.js#L93-L95)),
  +so ensure that your Backstage backend has connectivity to this host.
  +Otherwise users may see an `Authentication failed, failed to fetch user profile` error when they attempt to log in.
  +
  ## Adding the provider to the Backstage frontend
  To add the provider to the frontend, add the `microsoftAuthApiRef` reference and
  