Q 604: What is your opinion regarding one’s participation in Friday prayers nowadays when the Twelfth Imam is not present? Is it obligatory or not for someone to attend Friday prayers when they do not believe that the Friday prayer imam to be just?
A: Even though Friday prayer is considered an alternative obligation during this period of time and it is not considered obligatory for people to participate in it, one should not deprive oneself of the blessings gained through attending the prayer solely due to doubt about the justice of the imam or due to irrelevant excuses.

https://www.leader.ir/en/book/32/Practical-Laws-of-Islam