Hello and welcome to JustAnswer. I'm sorry to hear about your situation and hope I can help.
Unfortunately, Section 1253.3 of the California Unemployment Code holds that benefits are not available for "[employees of] an educational institution shall not be payable to any individual with respect to any week which commences during a period between two successive academic years or terms if the individual performs the service in the first of the academic years or terms and there is a reasonable assurance that the individual will perform the service in the second of the academic years or terms."
Since you received an assurance letter that you would be employed, you are, unfortunately, ineligible to receive unemployment benefits.
Was there a ruling in 2004 in favor of the sub teachers in San Francisco stating that a school is not in "summer recess" if summer school is being offered? I tried to look in the cases of the California Unemployment Insurance Appeals Board, but I couldn't find the docket number.
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