What could cause MismatchSenderId on some Android devices?

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    Nikolay Semenov

    try to use Browser Key instead of Server Key or vice versa

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    showplans

    Yeah, I've tried browser and server key but it doesn't seem to make a difference.

    (sorry for adding an answer instead of a comment, this karma system is dumb)

    e: another interesting thing is that even though I only have two devices, I end up with several users registered. All but one of them disappear when I send a push notification.

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    showplans

    Turns out I needed to create a new Google project, then use the browser key from there. Don't know what was wrong with the old one.

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