Unfortunately, as it is written in BOLD in the play store page and in the pictures, the watch face from the Google Play Store is designed for Wear OS only, and does not support Tizen OS 🙁
Basically, no Wear OS watch faces in the Google Play Store are made for your watch.
The Google Play Store shows the application as compatible because it only takes the mobile into consideration.
If you bought it, please send me your order number, and I will refund you.
In the meantime, if you are interested by my design, my Gear S2/S3 compatible app are available in the Samsung Galaxy Apps Store (or Gear Store).
Just search Thema for all my designs.