Sadly, Microsoft has retired the ADFSHelp site, and with it, the Claims X-Ray application.
It looks like the official replacement is the Gallery App called Microsoft Entra SAML Toolkit. Unfortunately, it requires a registration to trust your incoming token, instead of trusting all like Claims X-Ray did.
There are some third-party offerings that provide a solution similar to Claims X-Ray.
The best I've found is RSA and their SAML 2.0 Test Service Provider at https://sptest.iamshowcase.com/.
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