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Sign in failure

I'm on Android 5.1.1 (Samsung J5 (2015) and My Tennis Math 3.0.11 is not able to sign in. Only proposed way is Google. By tapping on in, nothing is asked, but after a few seconds it says: "Cannot sig in, please try again later." What can I do? I urgently need to back-up because I'd like to full-erase my phone.
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