Your AdminNoCachePolicy does not look right, you can inspect how OutputCacheMiddleware is executed here:

• https://source.dot.net/#Microsoft.AspNetCore.OutputCaching/OutputCacheMiddleware.cs,36bbedec3dbc3944,references

Also look at how the default implementation looks like, after that copy paste it and make changes so that it reflects your logic.

• https://source.dot.net/#Microsoft.AspNetCore.OutputCaching/Policies/DefaultPolicy.cs,2da295f8d4e197eb,references

Specifically, notice the lack of the following block in your policy:

context.AllowCacheLookup = attemptOutputCaching;
context.AllowCacheStorage = attemptOutputCaching;
context.AllowLocking = true;
 
// Vary by any query by default
context.CacheVaryByRules.QueryKeys = "*";

See how AllowCacheLookup and AllowCacheStorage is used in the middleware.