@Veniamina0
Google translates:
Hello, in April 2020 we made a trip to Prague, we used a $ 100 bonus to rent an apartment in Prague. Due to the announced ban on entry to the Czech Republic due to the pandemic, the trip was canceled. But our bonus had to be returned to us for use. Is it so? what about our bonus !? ... Respectfully yours, Irina Glukhova.
Answer
If the reservation is cancelled by yourself, the "bonus" (travel credit, coupon) will no be returned.
It is stated here:
https://www.airbnb.com/help/article/160/how-do-coupons-work