Xiaomi Mi5 problem: Alarm and Ringing sound coming only from the earpiece (not from speaker).

[Android Central Question]

Alarm and Ringing sound coming only from the earpiece (not from speaker).
All the volume sliders are raised to maximum
However the speaker work properly in all other functions ( music, while setting the ringing type.....) but on incoming call the sound comes only from earpiece

Please your assistance

Thank you