Try the following troubleshooting steps:
Use abbreviations (for example, "St" instead of "Street," and "Apt" instead of "Apartment").
If there is a "Address Line 2," move part of your street address there to make room for the city/country.
Some international postal codes exceed the 6-character limit for the Canadian box. If a digit is missing, try removing all spaces to see if the PDF generator detects the extra digit.
If none of that works, because you are mailing the return, you can correct your address on it. Because this is a paper return, the CRA's scanning systems and agents are used to seeing manual corrections to forms.
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