No holotape?
try this "Uncheck Sim Settlmeents and any expansions or addons of it from your load order, also uncheck HUDFramework - because it sometimes interferes with startup. Load your game and make a save outside of the museum. Now check in Sim Settlements again and load that save - the tape should spawn where it belongs. Once you have the tape, load it in your pipboy to get the unlock message. Now save again, and re-enable HUDFramework."