Docs: How to target a specific tenant (tenant id) with Fabric auth provider?

[situ042]

I'm trying to target a specific Microsoft Entra / Fabric tenant when using Rayfin's Fabric-auth provider, but I can't find any guidance in the repo README or the auth-provider-fabric package README.

My organization has two tenants and the one I need is not the default tenant. All the authentication requests use the default tenant and hence the fabric workspace I am using is not found because I cannot redirect rayfin login to my dev tenant.

What I'm asking for

• Where should a tenant id (GUID) be specified when using Rayfin with Fabric brokered auth? (rayfin.yml / project config, environment variable, SDK option, or in Fabric workspace settings?)
• Is there an example configuration (rayfin.yml, env var, or code snippet) that shows supplying a tenant id for single-tenant or cross-tenant scenarios?
• If tenant selection is handled outside Rayfin (e.g., by Fabric / Microsoft Entra), please confirm the recommended approach and where to document it.

What I checked

• Top-level README: https://github.com/microsoft/rayfin/blob/main/README.md
• Auth provider README: https://github.com/microsoft/rayfin/blob/main/packages/typescript-sdk/auth-provider-fabric/README.md
• Rayfin docs (aka.ms/rayfin/docs) — no references to tenant or tenant id.

Expected outcome

• A short guidance snippet to include in the docs and/or the auth-provider README describing how to target a specific tenant (example config + where to put it). If there's an existing example elsewhere, a pointer would be great.

Thanks!