Can I Be Charged A "move-in Charge" When I've Lived In The Same Place For Over 20 Years?

Location: CA. USA.

I'm in California, and I live in an apartment complex. Backstory: I've been living here in the same apartment unit with my parents and now Mom (Dad passed away over ten years ago now) for over 20 years (since i was 13). An investment Company bought the property mid December 2024, and Mom signed with them then, and had to make a Tenant Portal Account at that time, and their first rent check under them was paid in January of 2025. Mom was sent a text message in mid July of this year (2026), stating that the company needed my email address as well for me to make a Tenant Portal Account as well, so that they could "send the lease renewal". According to them, they needed both of us (mom and me) to sign their document and that their software "also requires a unique email for each signer", so each of us needed a different email address. Ok fine. I give them mine, but neither of us have been sent any kind of lease renewal documents, electronic or otherwise since they took ownership. I was sent the link to make a Tenant Portal Account and I made one in August of this year (2026). Still no renewal documents yet. I am now being charged what is called a "Move In Charge: Liability to Landlord Insurance" on my Tenant Portal Account that was apparently due on the 4th of this month (November 2026) (I just now saw it on my account, no direct email about in regards to it. I don't regularly check my Tenant Portal Account, as rent is paid through my mom's Tenant Portal Account). My question is this: can they legally charge me with a "move in charge" when I've lived in the same unit since I was a kid? To my knowledge, my mom didn't have to pay a "move in charge" when they bought the property and made everyone paying the rent sign a new agreement under them and create online tenant accounts, and I wasn't made to have an online account for myself till over a year later for reasons that haven't been followed through on as of yet, and now I'm suddenly being charged a move in fee due to being a liability to their insurance for some unknown reason. It's not a large fee. Only $10.50, but why now? And why at all? I've been living here consistently since 2004. I did NOT just move in recently on my own, nor signed any kind of rental agreement of yet, and the last time my mom signed anything, was when they took over in mid December of 2024. Can they legally charge me that fee??