I thought that Anandamaya Kosha belongs to Karana Shareera, infact I thought Anandamaya Shareera itself is Karana Shareera because it is said in Tattva Bodha, which is traditionally considered a work of Adi Shankaracharya.
But I recently saw this video where a Guruji belonging to Advaita tradition says that Anandamaya Kosha belongs to Sookshma Shareera. The video is in Kannada, but the rough translation is
Anandamaya Kosha along with three other Koshas of Pranamaya, Manomaya and Vijnanamaya Koshas constitute Sookshma Shareera with 19 parts, 5 Jnanendriyas, 5 Karmendriyas, 5 Pranas, 4 Antahkaranas.
So now I'm confused, can any one please give references from authentic work of Shri Adi Shankaracharya (preferably from his Prasthana Traya Bhashya) which clarifies as to which Shareera does Anandamaya Kosha belong to?