I just tested the new codes for Celsius Network and i got the money, so as per 6th of May 2020 they are working.
My referral link for you to use to get 10$ is 1235256530, use it before KYC in order to work. Then deposit 200$ in BTC after you put the promo codes for May.
The codes for month May are:
SPRING - deposit 100$ in BTC
POV - deposit 200$ in any coin
PAKMAN - deposit 100$ in BTC.
And one very good promo code HALFBTC will give you 50$ when you borrow 1000$.
It is enough to deposit 200$ once to activate all the codes and the referral. They are regularly giving new codes, every month, so it is a good idea to have a deposit every month after you put the promo codes in.
If you make a new account, once you open the app, click on upper right corner icon (a bear). Then you have the promo codes (see the picture).
Enjoy the free money.