IssuerSigningKey test is not robust

[jmprieur]

Microsoft.Identity.Web Library

Microsoft.Identity.Web

Microsoft.Identity.Web version

2.15.0

Web app

Not Applicable

Web API

Protected web APIs (validating tokens)

Token cache serialization

In-memory caches

Description

The IssuerSigningKey has a hardcoded keys document, and it's not robust as it will break when AAD rotates the signing key

Reproduction steps

N/A

Error message

No response

Id Web logs

No response

Relevant code snippets

N/A

Regression

No response

Expected behavior

N/A