RSA JWT Validation in .NET Can Fail Due to Algorithm Identifier Mismatch

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Developers validating RSA-signed JWTs in .NET may encounter signature validation failures even when the public key is correct. The root cause is often a mismatch in algorithm identifier format within the ValidAlgorithms configuration parameter. Some identity providers, particularly older WCF-based or enterprise SSO systems, express the signing algorithm as a full URI such as 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha256' instead of the standard short form 'RS256'. If only the short-form identifier is listed in ValidAlgorithms, tokens using the URI form are rejected despite carrying a cryptographically valid signature. The fix is to include both identifier formats in the ValidAlgorithms list, ensuring tokens are accepted regardless of which format the issuing service uses.

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