In Canada, polygamy is against the criminal law. Section 293(1) of the Criminal Code makes it a criminal offence to enter into a conjugal union with more than one person at the same time.
Nonetheless, the Ontario Family Law Act recognizes wives in polygamous marriages as spouses, providing the marriages were conducted legally under Islamic law abroad.
http://www.wluml.org/node/4422
Polygamous Muslims in Ontario receive benefits, although polygamy is officially illegal in Canada.
An abuse of the welfare system by GTA [Greater Toronto Area, ed.] Muslim men allowed to live in polygamous marriages under a controversial Ontario law was met with shock and outrage yesterday.
Politicians and the public reacted angrily to an exclusive story in yesterday's Toronto Sun about how the men collected social benefits for up to four wives.
Mumtaz Ali, president of the Canadian Society of Muslims, said hundreds of members of his community in polygamous marriages have been collecting welfare for some time.
The CBC 5th Estate did a piece on polygamy
https://www.cbc.ca/news/canada/polygamy-canadian-muslim-community-1.4971971