I may be a bit out of date, but if I recall correctly the return address needed to be on the front of the package for Canada. Hang on and I’ll see whether I can find anything else…
ETA yup, there is some info in this thread International shipping pros & cons - #12 by Fififoxi - you need to put the invoice on the outside of the package too.
This is the RM guidance for Canada, it tells you how to format the address correctly
https://www.royalmail.com/sending/international/country-guides/canada
Hope that’s useful!
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