Referral from old house to second home

I did a referral to join bulb as there was a crossover from moving into my new house and selling my old house. Per this post here:

I’ve not seen my referral credit though - how can I look into this?

The answer would appear to be in the thread you quoted:

Hi there @Windcaid actually in this case we are fine with you referring your second property from your first one. Sometimes our system has trouble processing this, so you can always ring up and make sure it's gone through, but it should be fine. Essentially, we just love referrals!