If you signed any documents to become a probationary member. I would probably say yes and explain the circumstances. No sense trying to hide this and later getting possibly caught and questioned about it at other stages of immigration. You are right. I dont want that either, but I dont think i am, lol. Ofc, if they ask me whether i joined, then i will say yes , i was a probationary one 3 years ago. Thanks for your quick response.