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Same on iPad. It’s not network
This set up working perfectly for me.
Amazon Prime Video app version 7..4.1 installed on iPad2 running latest iOS 12.4.1
Casting with Chromecast Ultra to Sony TV KDL40V4100.
Been working for me since iOS 10.1
For the second time in a week, Amazon Prime would not play on my LG smart TV tonight. The last time it happened, a day went by and Amazon worked fine again. This has got to be a FIOS issue.