It is a HEOS sub, so it is suppose to work with other HEOS products. The Home Soundbar 550 is also a HEOS product.

That being said, the DSW-1H HEOS sub (is that the sub you mean?) would NOT work with that 550 soundbar. There was suppose to be a firmware update that would fix this, early in 2021. But month after month (even update after update) [even after Denon promising it month after month]... it never did!!!
As of September, this combo still didn't work. And Denon was still promising future compatibility. I would NOT go this route unless the update has happened already and it is working. Because if not, good chance it never will.
The DHT-S716H soundbar does work with that HEOS sub thou.

HEOS is such a shi% show of products these days. I would NEVER recommend them to customers. I know a lot of dealers are still pushing them on customers but for the life of me I can't understand why (other than just profit motivation).