Now uninstall the application and reinstall it again on your device.
But at least we have a workaround.
There is a good chance somebody already posted a similar problem.
Gonna check the code to try to find out why it happens.
Failing this I would be correct in stating that Steam Guard via email is the only option.
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What is Steam Guard Mobile Authenticator? This has happened before but never like this.
Description: Thanks to two-factor authentication, however, you can protect your Steam account by requiring a one-use code to sign in to your Steam account.