At trainer level 39, I expect to be able to sign in to Wayfarer to attempt to submit a Pokestop. When I attempt to sign in, I receive a message that I can’t log in because I’m ineligible as I’m not level 37. Doesn’t make sense…
what method are you using to sign in to pokemon go?
Pokemon Trainer Club
You may also have to log out, and log back in with one of the 3 accepted login methods for Wayfarer: Apple ID, Facebook, or Google. PoGo Trainers Club and Niantic Kids are not eligible logins for Wayfarer, so you do need to make sure you have at least one of the above login methods linked to your PoGo account.
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Thanks! That may solve it. 
Welcome!