3976 - When the siddur and Shulchan Aruch of the Alter Rebbe differ, we go by the siddur.

Blessings for success in sorting out the laws of Bein Hashmashot. Just as before Friday Bein Hashmashot everyone is finishing up their work, we are in the Bein Hashmashot of time. May we finish our work of making this world a dwelling place for Hashem, and the night will turn into day. https://www.torahrecordings.com/rebbe/igroskodesh/012/003/3976