default or selected kernelversion does not have config value CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5.
Result is shown for kernelversion 6.9.9
Enable optional MD5 hmac cookie generation
configname: CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5
Default SCTP cookie HMAC encoding
└─>Enable optional MD5 hmac cookie generation
In linux kernel since version 3.1 (release Date: 2011-10-24)
Enable optional MD5 hmac based SCTP cookie generation