Siddha pranali- Sad Goswami’s gave to devotees..?!?

In Gaudiya Vaisnava Sampradaya, one often comes across this term- "Siddha Pranali.” But in Iskcon, Bhakti Siddhant Sarasvati Thakur rejected Siddha Pranali.
So, what is right- to accept Siddha Pranali or to reject Siddha Pranali ?
Whether our Acaryas, Sad Gosvamis accepted Siddha Pranali or not ??
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