Hopefully Thailand is no longer requiring any COVID shots so it should be marked as not routinely available.
If the applicant has not had a dose of the COVID-19 vaccine in the past 12 months, but a law or regulation in the country where the exam is performed prevents the applicant from receiving a dose at the time of the exam, document the “Not routinely available” blanket waiver.
https://www.cdc.gov/immigrantrefugeehealth/panel-physicians/vaccinations.html?CDC_AA_refVal=https%3A%2F%2Fwww.cdc.gov%2Fimmigrantrefugeehealth%2Fpanel-physicians%2Fcovid-19-technical-instructions.html#covid-19-vaccination