Sims 4 MCCC issue

I found this on Deaderpool's site where I got MCCC in his FAQ section.  Hopefully it will help!

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Maximum Household Size isn't working! I can’t add new Sims to my household! AKA: “How do I add Sims to households with more than 8 maximum Sims in it?”

You cannot use the standard Sims 4 methods for adding Sims to households if you have households of more than 8 Sims. It is hard-coded in the Sims 4 UI code for Manage Households and CAS to only allow 8 Sims. In the same way that you can't use the "Edit Households" option of CAS with large households, you also can't add/remove Sims in the normal Sims 4 manner. Adding Sims to households can either be done using the Testing Cheats method (if Testing Cheats are enabled) of shift-clicking on a Sim and adding them to your family, or by using the “sim_move” command as documented in the MC Command Center module's documentation. “sim_move” can be used for moving between different households or adding them to the active household. Also, as of MCCC 5.0.0, there is a Sim Command in the Sim MCCC menu under “Maintain Sim” to move Sims between different households. This works with no problems with households of more than 8 maximum Sims.

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Are you trying to add them the normal way?   If you are that's probably the reason what's described above.     He lists three good ways to add sims, hopefully it will work for you!   If you have testingcheats on and are near the sim you want to add you can shift+right click on them and add them that way quickly.    I haven't tried the sim_move command or the option in Maintain Sim before in the MCCC menu, but I bet they work fine too.