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Using MSAL.NET for client credential flow in multi-tenant services

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Decision point - Microsoft.Identity.Web or Microsoft.Identity.Client (MSAL)?

If you use ASP.NET Core, you are encouraged to adopt Microsoft.Identity.Web, which provides a higher level API over token acquisition and has better defaults. See Is MSAL.NET right for me?

Decision point - token caching

MSAL maintains a token cache which grows with each token acquired. MSAL manages token lifetimes in a smart way, so you should use its cache. You have the option of using in-memory caching or distributed caching.

See MSAL.NET Token Cache Serialization.

We recommend using persisted distributed caches (e.g. Redis, Cosmos etc.) for all user flows.

We also recommend that multi-tenant service 2 service apps use persisted distributed caches. But you may get away with using a memory cache with evictions if you know that your service needs app tokens for a limited number of tenants.