After upgrading to 13.0-64.35 Gateway SSO authentication breaks or you encounter “Cannot Complete Your Request” error.
 

Build 13.0-64.35 onwards ADC improves the security by disabling some weaker authentication methods like Basic, Digest or NTLM for SSO. If you are using any of these authentication method then refer to Citrix Documentation - Disable the weak Basic, Digest, and NTLM authentication globally to resolve the issue.

Note: StoreFront SSO configuration is impacted (disabled) only for 13.0 build 64.35. The configuration will not be impacted in the future 13.0 builds.