Alright, question: Do you use any content blockers? I've found that it works absolutely fine, provided you're not running any ad blockers, Ghostery, or other such things. If you do, they block the scripts that Google uses to log users in. As you're on iPad, try holding down the refresh button while you're on the site, then press "Reload Without Content Blockers." If I do that, it starts working. If that works, then I'd suggest whitelisting Pokécharms so that doesn't happen again.