Amrit Siddhi Yog is an auspicious time-combination used in Indian panchangs. It is formed when certain weekdays align with specific nakshatras, and it is generally considered favorable for starting important works, spiritual activities, or ceremonies. In Jain community calendars and events, it is sometimes noted as an auspicious muhurat, but it is not a core Jain scriptural doctrine; Jain dharma places primary emphasis on samyak darshan, vows, and right conduct. ( astrosantosh.com)

If you meant the Jain usage, it is usually just a panchang-based शुभ योग mentioned for timing, not something that changes Jain spiritual principles.