Can't access full Legacy PHB (sublcass) options in Character Builder even though I own source material

So I'm trying to rebuild my old level 12 Rogue Assassin using the 2014 rules on DnDBeyond. 

I own the digital source book on DnD Beyond.

I have the legacy option turned on in the Home section of the sheet.

But when I go to choose the Assassin subclass the only one available to me is "Thief"

Can anyone help please because I'm lost on how to fix this?

You have selected the “ ore rules” (2024) version of the rogue as your class. Go to the character builder for that character and where you select the class scroll down and select the “legacy” (2014) version of the rogue instead.

You're a lifesaver - thank you! That was doing my head in and I'm not sure I would've thought to check that.