Help with CrakRevenue

So I just started experimenting with CPA. I wanted to make sure my offer on crakrevenue worked before I started promoting it, so I sent my DOI link to a friend who then signed up for the offer and verified his email address. I was expecting to see that 1 conversion show up in my statistics, but it has not. Am I doing something wrong? Why is the conversion not showing up?

I tried this with another offer as well and still, no conversion.

My guess would be either A) conversions take a bit of time to show up in the system or B) if it was the same friend who signed up to both offers, it tripped their fraud protection. I'm leaning toward B).

it's can be 1) Fraud protection 2) email already have in database advertiser 3)Offer have age target 4) "Friend" used proxy.
Better way if you ask this question in their support

The reason probably in using of proxy. Anti-fraud.