Authentication and Token Management Issues in Microsoft Teams Tab App with SSO and Microsoft Graph API Integration

I am developing a Microsoft Teams tab application utilizing @microsoft/[email protected], React, Node.js with MSAL, and Microsoft Graph API integration.

While initial SSO via microsoftTeams.authentication.getAuthToken() and on-behalf-of token exchange functions correctly, silent token refresh frequently fails with “interaction_required” errors, necessitating disruptive popups. This issue intensifies with guest users across tenants and yields AADSTS50058/AADSTS7000218 errors despite Redis caching, acquireTokenSilent fallbacks, and verified manifest configurations.

Additionally, delegated tokens from the tab cannot consistently authorize proactive bot messages via Graph’s ``/chats/{id}/messages endpoint (403 Forbidden)

I seek formal guidance on silent refresh patterns without popups, cross-tenant guest authentication best practices, integrating tab SSO tokens with bot-initiated messaging, and strategies to diagnose and mitigate Graph rate limits at enterprise scale. Relevant documentation lacks depth on these scenarios; code examples or resolved cases are appreciated.