Hello,
SOAP Settings are already enabled.
soap
Soap Client enabled
Soap Server enabled
Directive Local Value Master Value
soap.wsdl_cache 1 1
soap.wsdl_cache_dir /tmp /tmp
soap.wsdl_cache_enabled 1 1
soap.wsdl_cache_limit 5 5
soap.wsdl_cache_ttl 86400 86400
Does that need some other configuration?