This silently fails in ASP.NET Core 2.1

[gtrak]

Given this Startup.cs config:

services.AddDataProtection()
             .SetApplicationName("my-app")
             .PersistKeysToDistributedCache();

I see logs:

Using an in-memory repository. Keys will not be persisted to storage.

And sessions are still lost across restarts.

An exception was thrown while deserializing the token.

Microsoft.AspNetCore.Antiforgery.AntiforgeryValidationException: The antiforgery token could
not be decrypted. ---> System.Security.Cryptography.CryptographicException: The key
{66e01a09-21d3-4cd5-865f-a021dd1d23d5} was not found in the key ring.

I verified that key was created earlier with the same distributed cache config, and the cache is indeed working for other cases.

I'll probably try S3 but wanted to make this a github issue for the next person.

[adamhathcock]

I haven't updated this in a while. No idea how the current code plays with ASP.NET Core 2 or 3.