Simple iRule failing

Because you are comparing a tolower string to a mixed case string, the evaluation will never be true. Change your URI to the below. Notice Service is now service.

when HTTP_REQUEST { 
        if { [ string tolower [HTTP::uri]] contains "/httpservices/login/loginservice.aspx"} {                HTTP::redirect https://login.devstage1.weightwatchers.com/mobilelogin/mobile 
        log local0. "Chassis Redirect" } 
}