Subdomains Option do not work with a comma seperated list of domains

Hello,

On whmcs side at Products/Services/ & On the "Other" Tab, I filled in the Subdomains Option :
a comma seperated list of domains: .clinic.ph, .autoshop.ph, .bakeshop.ph, .builders.ph, .farms.ph

With or without space after the coma, it do not display any domain list, in customer order

Any idea?

Thank You