Microsoft.Identity.Client.Cache.Items.MsalRefreshTokenCacheItem class MsalRefreshTokenCacheItem : MsalCredentialCacheItemBase Documentation Code public string CacheKey { get; } public string FamilyId { get; set; } Optional. A value here means the token in an FRT. public IiOSKey iOSCacheKey { get; } public bool IsFRT { get; } Family Refresh Tokens, can be used for all clients part of the family public string GetiOSService()