If you reach a contest settlement and you have chosen not to compete, I think it asks you again if you are competing to confirm your choice.
If you are playing the same game, it shouldn't keep asking you that question, so I'm not sure why you mean by "it will not activate on login anymore'.
Also, please note that Yagisan is not actively supporting or responding to Contest questions anymore, nor is he the mod author for
City Plan Contest Assistant.
Yagisan supports the City Planner's Assistant Wabberjack Collection.