I don't know if IRCC technically allows fingerprinting outside Canada or not (Personally I don't see any issue since you're allowed to travel after filing your citizenship application but I have no personal experience).
If you're asking if there is a mode available to get RCMP fingerprints while being outside the country, I've seen quite a few fingerprinting agencies offering that on their websites. Like this one.
https://nationalpardon.org/fingerprinting/
From the list, select:
Not sure how all the mailing works (like if you can directly mail it to IRCC etc), but overall it seems possible to get fingerprinted while outside Canada.
I believe they charge you a lot more money compared to the same domestic service so you might have to shop around.
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Thanks for your reply , it seems possible! the big question is would IRCC mind this! I guess ( and im guessing now) it would be ok. because as long as IRCC is ok then i dont see why IRCC would mind
my wife applied her application last dec and till now even her BG check is not completed. Her plan was to pursue a master degree in UK for one year ( starting last month) but we delayed it becuase of the citizenship application
Now we are thinking she should start next semister ( march) even if we dong hear from the IRCC. by phone the agent told her 6 months ago that on his side it shows that she is required to do fingerprint but Nothing formal till now
So i guess she might do them in the UK and definetly it will worth the price then coming back to canada