Cannot find Hong Kong phone prefix (HK +852) in the region list for two-factor code

[lchiang]

I wish to add my phone for two-factor security code. But I cannot find the correct phone prefix in the list.

There is no option for Hong Kong phone prefix (HK +852) in the region list for two-factor mobile phone.

https://www.paypal.com/myaccount/security/flow/twofactor/authentication