Can I help another person digitally authenticate and endorse their PDT or get their Vaccination HealthCert issued?

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• How long does it take before I can request my Vaccination HealthCert, after signing up with a Singpass account?
• I already have other Government apps e.g. HealthHub, TraceTogether app that show my test and/or vaccination status, do I still need a Pre-Departure Test (PDT) and/or Vaccination HealthCert?
• I have a Pre-Departure Test/Vaccination HealthCert with offline QR codes compatible with the EU Digital COVID Certificate (EU DCC). Why are they considered ‘invalid’ by some COVID certificate reader applications?
• Where can I find and store my HealthCerts?
• Who can obtain a Vaccination HealthCert?