It's Disney+ (or maybe one of their bundles). "Electro" is probably a truncation of a word like "electronic". Have you checked your subscriptions at https://my.roku.com? If you have (or have ever had) multiple Roku devices, you may have more than one Roku account, so check the email address that's displayed on each device under Settings->System->About and use whatever you find when you log into the website.
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