No, it would be get your child up-to-date or we will not let you sign into the class/school.
When my son was in the online school, they provided the computer and all materials. Students were allowed to sign in as soon as all their paperwork was in and approved.
But, yes, in the real world, some people would just say they will get up to date in a month or so and the school, needing "bodies" would allow students in and in the chaos, forget.
"Vaccines are like a box of chocolates. You never know what you're gonna get - acute hemorrhagic edema of infancy, allergies, anaphylaxis, asthma, autoimmune disease, diabetes, eczema, petit/gran mal seizures, fibromyalgia, Henoch-Schonlein purpua, Dravet's Syndrome, Retts Syndrome, Sweet's Syndrome, Hughes Syndrome, encephalitis, speech delay, tics, neurological damage, coma, ADEM, ADHD, AFP, ASIA, CFS, CRPS, GBS, ITP, JPA, JRA, LGS, LKS, MS, OMS, ORS, PANDAS, PANS, PINTANDS, POF, POTS, RA, SIDS, SJS, SLE, SPD, SUDS, TPI, the disease one is being vaccinated against, or death."
Paraphrased from "Forrest Gump".
List from the drug companies' own package inserts that come with their product as required by law.