When I search the Roku channel store, I cannot find any ABC app available. There are many apps that provide some access to specific local ABC stations, but even there most of them are primarily only providing news feeds. The only way I know of to get the ABC network feed along with local station content is by using one of the streaming TV providers. These include Fubo TV, Sling TV, YouTube TV, and others. ABC owns Hulu (which is all owned by Disney) so Hulu might have a TV feed as well.
I don't know from what source you were getting ABC content, but they only way I know of getting it is what I have listed above.
Dan
Roku Community Streaming Expert
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