Hi, I was also in your position. Basically, you update the TAU on your application; you can still do this by logging on. Also, email each admissions office. For UCSB, I called and was intructed to email admissions@sa.ucsb.edu and would be alerted about any extra information. They haven’t so far, and this was for their Math 8 which is not a requirement for admissions but eventually needed.
Anyways, I followed the same protocol for the other UC’s even though none of the majors required said class.