In summary, you may still be granted a divorce even if you can not locate your spouse. (familylawhelp.ca)
The filing spouse must make reasonable efforts to locate the spouse before filing this motion and include verification from a process server that attempts were made to locate the defendant. (info.legalzoom.com)
If you did locate your spouse but were unable to serve him or her, you must show evidence of the steps you have taken to attempt to serve him or her. (familylawhelp.ca)