Hello @Daniel82,
The referrer doesn't get the referral credit until the new host completes the first qualifying reservation. That is until the new host's first qualifying guest stays. To qualify, the reservation must be for a minimum amount, usually equivalent to US$75 before fees and taxes.
Ye may have done this but just in case ye didn't realise it, the new host must have not have had an existing Airbnb account and must have signed up using the link in the referral email they received from the referrer.
The article below has information on the requirements.
https://www.airbnb.ie/help/article/84
Steve.