Let's clarify some things to be sure we understand as there are several possible variables here.
What are all 3 tvs? Smart TVs that have a built in Disney+ app? TVs with no Disney+ app but a Roku connected? Which ones work with Disney+ and which don't?
How did you take out your Disney+ subscription? Directly with Disney+? Through Roku? Through some other third party?
How are you trying to access Disney+ through Roku on the problem connection? The Disney+ app on the Roku? Through The Roku Channel?
Similarly, how are you trying to access Disney+ on the connections that work?
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