OpenSite+ requires network requests to enable all of it's features. Ensure these domain are whitelisted:
*.applicationinsights.azure.com/
*.bentley.com
*.cesium.com/
*.itwin.org
*.sentry.io
*.services.visualstudio.com/
*.statsig.com
*.statsigapi.net
*.statsigcdn.com
*.virtualearth.net/
cloudflare-dns.com
featureassets.org
imodelhub*.blob.core.windows.net/
prodregistryv2.org