I have clarify with IRCC that I am outside Canada and kindly request to schedule the oath.
This is the respond:
We cannot schedule you into ceremony until you are in Canada and we have proof of return to Canada. You will need to email us when you are back in Canada with proof of return (example: passport stamp, boarding pass). At that point you and your family will be put into the ceremony available list and scheduled at an as yet undetermined date.
Good news is this appears to indicate no outstanding questions or concerns other than confirmation of your presence in Canada and availability to participate in an oath ceremony IN Canada.
In regards to what you now do, as I discussed in previous posts, this means you --
-- need to return to Canada, and advise IRCC when you have done that, or
-- make a request/demand that IRCC proceed with scheduling the oath
Fastest and most certain path would be to return to Canada and submit documentation showing your presence IN Canada:
Any objective documentation that shows return to and arrival in Canada, or actual presence in Canada, should suffice (your "proof" is not limited to their examples). That said, while this appears to indicate verification of presence in Canada will result in being scheduled for the oath, without any further processing of the application, the door for further inquiry or scrutiny always remains open right up to the day the oath is actually taken.
Remember, the last background clearance is not done until the oath is actually scheduled and may not be done until just before the oath itself (within day or three), so there is always some possibility that a scheduled oath is postponed or cancelled and there is further processing (this is true for all applicants, not just those who were abroad after applying, and of course it only happens to a tiny percentage -- of the 53 scheduled for the oath at my ceremony, only one was not allowed to proceed with the oath, and my impression is that in many if not most ceremonies everyone scheduled and appearing gets to proceed).
Also remember there is no guarantee how long it will take for you to be scheduled for the oath after your return. There should be no restriction on your capacity to travel abroad again pending scheduling or attendance at oath.
Personal request/demand that IRCC proceed with scheduling the oath:
As noted and previously discussed, you can specifically request IRCC to proceed with scheduling you for the oath. Frankly it appears your local office will not proceed with scheduling the oath absent proof of return to Canada.
Alternatively you can personally (without a lawyer) make a formal DEMAND that IRCC proceed to schedule you for the oath. Even if you are able to make a demand comparable to what a lawyer would send, here too, frankly, it appears likely the local office would not proceed with scheduling the oath absent proof of return to Canada.
Demand by lawyer that IRCC proceed with scheduling the oath:
A formal DEMAND made by a licensed Canadian lawyer would have better odds of getting the local office to proceed with scheduling the oath without first proving you are back in Canada. This would be the prerequisite demand necessary to follow through with an application for a Writ of Mandamus. There is no where near enough reporting to know this has a high probability of working (there is almost never any guarantee something like this will work because there is always the potential for other issues), but enough reporting to indicate some applicants have had positive results when their lawyer has made the pre-mandamus formal demand.
I previously described some of the hurdles or difficulties this route involves, including the difficulty of arranging this from abroad and the likely expense. Moreover, how long this would take is uncertain. Best case scenario is that the local office promptly comply with the demand, but it might not even respond for a significant amount of time, or even not respond at all. And the response could be to not proceed, or to in effect not proceed evidenced by not responding, in which event the question would be whether to proceed with making the application to the Federal Court for a Writ of Mandamus . . . in addition to the expense involved that could take a year or even much longer.
I have already rescheduled my previous oath ceremony
Does not change what I describe above but for others who are abroad after applying it is one more anecdotal report illustrating risks associated with being abroad while the citizenship application is pending.