3. The groups included comprise short-term work pass and special pass holders, such as those on Training Employment Passes (TEPs), Training Work Permits (TWP), Work Holiday Passes (WHP) and Special Passes. It will also be made available to eligible Short-Term Visit Pass (STVP) holders who have been in Singapore for at least 60 days continuously, many of whom who were unable to return because of global travel restrictions during the pandemic.
via https://www.moh.gov.sg/news-highlights/details/covid-19-vaccination-extended-to-eligible-short-term-pass-holders