Persian was the official language of Sindh During:

فارسی کس زمانے میں سندھ کی سرکاری زبان تھی

Soomra period

Sama period

Arghun period

All of these periods

Persian had been the official language of Sindh during the Arghun period (1520-. 1555 CE)

Sindhi had been used as the official language during Soomra and Samma period.