pointing my ingress domain something.com to kubernetes ingress domain web.example.com using cname is not working

 have a domain name web.example.com in kubernetes ingress . When I point another domain something.com to web.example.com the ingress is not allowing this domain . The page is not opening . I need several domains to kubernetes ingress domain . These domains belongs to different customers . So what ever domain point to my domain web.example.com it should work . The other domains are pointed to ingress domain using the cname of the customer domain . tried to point my domain something.com to my kubernetes ingress domain using cname

not helpful