polygamy is illegal in Finland. Finland follows a monogamous marriage system, which means a person can be legally married to only one spouse at a time. Marrying more than one person simultaneously, or bigamy/polygamy, is not recognized or permitted under Finnish law.
If any changes have been made to the law , I recommend checking with official government sources or legal experts in Finland to get the most up-to-date information on their laws related to marriage and polygamy.