Generally, you will want to re-install the game on playstation if you are switching from disc to digital: https://www.bungie.net/en/Help/Article/45179
As for sharing digital licenses between accounts, that is a console feature and supported by Sony/Microsoft. If you have changed the 'primary' console setting, that could explain why the CE items are not equippable by your K account. There are links to the Sony/MS support pages here: https://www.bungie.net/en/Help/Article/12458
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the sharing has nothing to do with it u bungie #@*#$, , , its on your end i can assure you, and i want mine fixed as well, u guys r tight enuff without blatentlly ripping us off, , oh wait yas do that all the time, raids still owed, content we paid for no longer available, yea, gettin real sik of u c#@ts