Disney+ started getting strict about password sharing in Canada last year, and now it's expanding the restriction to the US. According to The Verge, the streaming service has been sending out emails to its subscribers in the country, notifying them about a change in its terms of service. Its service agreement now states that users may not share their passwords outside of their household "unless otherwise permitted by [their] service tier," suggesting the arrival of new subscription options in the future.
The Verge says Disney+ told subscribers that they can analyze the use of their account to "determine compliance," though it didn't elaborate on how its methods work exactly. "We're adding limitations on sharing your account outside of your household, and explaining how we may assess your compliance with these limitations," Disney+ reportedly wrote in its email. In its Service Agreement, the service describes "household" as "the collection of devices associated with [subscribers'] primary personal residence that are used by the individuals who reside therein." The rule already applies to new subscribers, but old ones have until March 14 to feel its effects.
See if the TV supports DLNA by any chance, Jellyfin does, so all you'd need would be a DLNA controller app on your phone to make one cast to the other.
Alternatively, there's a self-hosted app called BubbleUPnP Server that can DLNA-enable (some) things without native support. I know for a fact it can do it for Google devices, maybe it can do it for Samsung too.