There was some bug on a previous version of the game that forces you to replay the coffee shop scene with Megan (if you want to invite her later to the party), don't use a old save game. It doesn't matter if you're on Alicia route and at the same time with Megan, MC is leaving the door open to both girls.I have tried this and put all the correct answers in, but she only ever accepts if I say yes to Alicia earlier which puts me on her path? If I say no, and follow the Megan path the exact same I cannot take her to the party
This is where you decide which one you'll invite to the party (when you're spying at Megan):