Don't know the Nook reader. But my Tolino reader didn't work with series -.-
The Tolino reader has a really rudimentary library.
I'm helping me with the fact, that I write the series Information to my Book title, with the Metadata plugboards export.
Could it be, that the Nook-Reader need this workaround, too?
If yes, see my other post
https://www.mobileread.com/forums/sh...08#post3670208 with the attached image.