Cloudflare won't connect DNS to my domain

Hi all,
my domain: http://айдамагазин.рф/
what could be the problem? DNS does not find.

Cloudflare status: Pending Nameserver Update.

Check whois NS:
nserver: bruce.ns.cloudflare
nserver: vera.ns.cloudflare.com.

Your domain does not appear to be active

state: REGISTERED, NOT DELEGATED, UNVERIFIED

You need to contact your registrar.

I am trying to transfer my domain from Shopify to CloudFlare and Shopify insist a small piece of authorisation code they have generated will be needed by CloudFlare. So far I can’t find where to put it!
I have inserted CloudFlare’s nameservers in the correct spot a week ago but it is still pending.
Can anyone help with this?