Re: "Unknown region: region _Residential_BayArea" On San Sequoia Resident Profiles
@Sims4Ever2022 I don't have any Mods/CC in my game, including MCC, and in my game when my Sim went and met meet Christopher Michaelson, in his Sim profile I only saw what is below (not his home residence), so I assume that this additional information that you're referring to (where the Sim lives) is coming through one of your Mods, perhaps MCCC from what you say. If this is an aspect of MCCC or a different Mod that you've added to your game, you could look for if the Mod(s) has/have updates that since the release of Growing Together, since both Christopher Michaelson and the San Sequoia world were added with that pack. Perhaps they have not updated the code in the Mod(s) to identify San Sequoia yet, or perhaps they did and you need to add a Mod update(s) to add this function to the Mod.
Edit: I see that MCCC has an update that's required for Growing Together, so you may want to add that update, if you haven't already.