User can't log in with their SSH key and I'm getting this error in /var/log/secure

synopsis: This article explains how to resolve SSH login issues by updating a user's public key, either through the Ezeelogin backend or by manually editing the authorized_keys file on the gateway server. 

Make sure that your public key is not corrupted. Try generating a new public key and paste it in the backend.

Refer the following article to update the ssh gateway users public key.

Alternatively, you can update the public key by sshing into the gateway server and paste the public key in /home/user/.ssh/authorized_keys

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