According to my own research, the Mate 10 Pro should fit in this sports armband.

Ecco un prodotto compatibile : Hama Functioning XXL (Universal)

The phone inserted in the picture is a Galaxy Note 5, which measures 153.2 x 76.1 x 7.6 mm. A Samsung Galaxy S10e has 142.2 x 69.9 x 7.9 mm. So it should fit :)