You don't submit your Ukara away through an airsoft site. You send your site membership to a shop like fire support or zero one. If that airsoft site isn't insured the shop won't create an ukara number for it.
Ahh gotcha, my first site was partnered with a shop so they did the whole thing! Pretty poor effort from the site to not be insured, hope they aint running games without it!
I got my UKARA done through my site, who have a local UKARA registered shop. My UKARA is fine and valid, however when a retailer runs a check, they get a warning saying that the site my UKARA is with, has had it's insurance expire. I managed to speak to another retailer and they confirmed that UKARA is my defence, the fact my site has an expired status doesn't mean I'm not a skirmisher and let me purchase.