Hi @Karen and Scott !
Occasionally, you may encounter an error message informing you that your account is being listened to on another device. This may be because your account’s music is already playing on another device that belongs to you
With Deezer Premium and Deezer Student, you can link up to three devices to your account. It's important to note that you can only play music on one of the three devices at any one time. These subscription offers are designed for individual users, not multiple users or families.
Tip: If you're interested in a plan that accommodates multiple users, see our Deezer Family offer
here is helpful link
Account Being Used On Another Device
https://support.deezer.com/hc/en-gb/articles/360001430465-Account-Being-Used-On-Another-Device
Deezer Family
https://support.deezer.com/hc/en-gb/articles/115002459285-Deezer-Family