ICANN is the international body running the domain system. Via RAA it sets rules.
Email verification rule
When registering an international domain (.com, .net, .org), a verification email is sent to the registrant.
15 days
You must click the verification link within 15 days. Otherwise, the domain is suspended.
For .UZ
.UZ is a national zone, RAA doesn't apply. No verification needed.
If not verified
There's a resend button in your cabinet. Open the email, click the link — back online in minutes.