I recall my 3 kids received a letter from their HS requesting permission to send their info to the UCs for ELC determination. Maybe your school didn’t send or is not participating.
Do you know if other students from your school receive notification. In the end, even if you are not ELC in local context, you can be ELC through the statewide path.
For Statewide Path:
There is a calculator. Google “UC statewide path admission calculator” . You can enter your stats and see if you qualify.
For ELC in local context:
“After submitting a UC application, a student from an ELC-participating school can return to the My UC Application page to see whether or not they have been designated as being in the top 9 percent of their class.”