According to my research, ADFS 2.0 supports WS-Federation and the SAML 2.0 protocol (SAML-P). SAML 1.1 is only supported as a token format. This makes sense since WS-Federation supports various token formats, including SAML 2.0 and SAML 1.1. So SAML 1.1 support due to token problem ...
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