Unable to change apple id to email with top level domain ".family"
I want to change apple id to my new email address on my own domain ending with ".family"(***@barl.family). It looks like that the validation of email address is not updated to "new domains" - the family is valid since 2015/2016. Neither Microsoft nor Google has a problem with ".family" domain, why is it still not possible with Apple?
(Barl is only for illustration)
[Image Edited by Moderator to Remove Personal Information]
iPhone XS, iOS 12