I put my work email in and got no credit.

[Dante11]

I added my work email and recevied no credit 

[Clare0]

@Dante11 You will receive your Business Travel Credit once you have completed a qualifying reservation of $75 USD or more excluding Airbnb's service fee, guest fees and taxes, if applicable.  The credit can be applied to your next trip. 

Here's the link that explains: 

https://www.airbnb.com/help/article/1167/airbnb-for-business---50-promotion

Hope this helps!