On the UC app is CA SSID required?

"If you know your California State Student ID, enter it here.

Your CA SSID can be found on your high school transcripts. If you can’t find it, please contact your high school counselor."

Is this section required? I contacted my high school and they can’t locate my high school ID #

Sorry guys I found the answer regarding my own question on the Q&A on the right side of the UC app page

It states:

“What is the CA SSID?
Every K-12 student in California public schools is assigned a statewide ID number. The unique 10-digit number enables the state Department of Education to comply with federal data-reporting requirements as students progress from year to year and school to school. Providing this number is optional.”