Sometimes Google experiences problems with their Google login, so I recommend you try
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Delete your cookies (not just cache) and see if that resolves the issue.
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If not resolved, reset application permissions for Focuster via the Google.
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Go to: https://myaccount.google.com/permissions (opens in a new tab)
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Find "Focuster" in the list of applications. Click "Remove Access"
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Try to login to Focuster again
Let us know if either of those steps works for you.