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1. IRCC needs us to inform them via a ;web form' - of your inability or unwillingness to travel. Should raise a second web form once you are ready/able to travel. IRCC will provide instructions then.
Note: IRCC ops manual mentions steps to keep the file open, So they are not disqualifying/cancelling any CoPRs. Re-medicals or not is yet to be determined. Some members have mentioned - 2 folks I think - that they were NOT asked for re-medicals. Neither were applying from India, fwiw.
2. 14 day appears to be the norm worldwide. It will be advisable to have a firm, clear honest plan for 14 day quarantine.
3. Airport kiosk for SIN is not currently operational. No information about re-opening has been presented.
4. Taxis are available, no hassles. Plenty and allowed for anyone including those leaving the airport to proceed for quarantine.
5. All online. one must go directly to the place of residence, straight from the airport. Once you enter your place of residence, then in theory you must not go out for 14 days - unless there is an emergency of sorts.
Hope this helps - as always, do research as much as possible, not all my information may be accurate!
Wish you the very best - safe passage to Canada!