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Works fine on all other platforms, except the iPad.
It is the Safari privacy settings.
Disable private browsing in iOS and Safari.
Yes, I'm serious.
Apple prevent Google from shipping their own Browser, so Chrome on iOS is actually a wrapper of the Safari libraries and is subject to the Safari preferences.
The Safari and iOS private browsing modes block third party cookies, which wipes out Persona.
Disable Safari and iOS private browsing, and Chrome works.
I get this too, would be glad to know the reason why. Persona works fine when using Chrome both on my PC and on my Android phone.
Persona never signs you in, so this isn't possible.