After having this issue, I noticed a lot of other people were having it, so Hopefully this helps.
1. Go to settings, than scroll down until you see your email.
2. Under that, it should say 'Connect another email'. Click that and connect a different email, or click 'connect google account' which should let you sign in with google
3. After clicking settings, up to where you see you have clicked it and next to that it will say email. Click that. Then allow KA to send you emails.
4. Now that you have two accounts connected to your account, choose the right email as your main one for KA to send emails to.
5. Go back to where it says 'Add another email' and hover over the wrong connected email. Then press 'delete this email.'
6. After confirming that you want to delete that email, sign out of your account and perhaps even shut down your computer for a little bit. Then log back in.
7. You should be able to comment now! Hope this helps :)