@Dazzar51 according to Sky's Discovery+ help,page you can use the app on multiple devices but a forum sesrch returned this thread where other members were complaining about the same issue on the app on both Q and Stream last year and a google search showed smart TVs etc can also be affected.
Discovery manage this app themselves rather than Sky but as far as I know have not fixed the annoyance.
You can manage devices through their website in the account system maybe worth editing some of those as each of my devices had multiple entries.
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
