We’ve updated our eligibility requirements here: https://yt.be/help/tmhG . If you’ve previously had access to Channel Memberships in the Gaming app, you will receive an email confirming your eligibility on the main YouTube app. Hope this clarifies.
Yes, i've had access to Channel Membership before, this was back in 2017. I just received my Monetization back for my channel, and i still meet the updated requirements. Will it take long for the E-Mail to be sent?