What counts as a service fault in beach tennis?

A service fault occurs when the served ball lands outside the service box, hits the net without landing in the correct box, the server foot-faults, or the server misses the ball completely when attempting to strike it.

Full Explanation

Per ITF Beach Tennis Rules Rule 7, service faults include: the ball not landing in the correct diagonal service box (long, wide, or into the net without clearing to the box); the server touching the baseline or baseline extension before striking the ball (foot fault per Rule 7.2); the server making two swing attempts at the ball; the ball striking the server's partner or anything they carry or wear before landing in the service box. A fault does not end the point: the server has a second serve attempt. Two faults (double fault) lose the point. A net cord that lands in the correct service box is not a fault but a let; the serve is retaken.

Ruleset: ITF  |  Rule Reference: ITF Beach Tennis Rules, Rule 7 (The Service)