This means that after the 'Valid till' date, your Vaccination status on the App will change and you’ll not be able to use it to enter places with vaccination requirements.
To retain your Vaccination status on the App, you may need to get an additional vaccine dose or complete the full vaccination process. If you're travelling in Singapore, please check the Singapore Ministry of Health's website (https://go.gov.sg/postvacc) for the latest policy on recognising vaccinations done overseas.
Have more questions about your vaccination status? You may use this calculator to check why you may need an additional vaccine dose and when you are eligible for it. If you need other help with your vaccination status, submit a query at https://go.gov.sg/vds-query-form.