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We'd suggest your restart your phone and then to log out and log back in again. If that doesn't help, you can give these steps a go and run a clean reinstall. That way you can make sure the app is up-to-date and the cache is not causing any issues.
If that doesn't do the trick, you can try with another network. Does the issue persist?
Keep us posted! If you have more questions, we are here for you.
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