AMC was never part of the Essentials package, but it was on free preview for a while. Since covid-19 started there were quite a few channels that were on free preview but the free preview period does eventually end.
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Thank you for your feedback, but in my case this is very strange, since last year I have been following the TWD chapters as well as those of Better Call Saul without any problems and I had no disabled or anything like it. Just two weeks ago, the canal was removed