Thanks for reaching out. You've to sign out of all the sessions and sign back in on the device that you are referring to as it accepts only a single device login. If you want to login to the other device, sign out of current device and sign in to the different device.
We'd like to know more. Could you share screenshots of the issue & error message for us to help you in a better way? Keep us posted.
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We suggest adding extra layers of security to your account w/ these tips: https://goo.gl/8ahrLA . Hope this helps.
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