Since about 0100 UTC today everything returns "need to login" for .Prime/UK
try this - go into settings - click preferences - under preferences click amazon - under amazon prime video region - choose UK (amazon.co.uk)
retry your movies again
Probably not affected. It seems user specific. Like I have two accounts one with prime and a business one that doesn't allow prime. I tried with the first episode of Countdown as it is free without prime. I can watch it in chrome browser with my business account but can't with my personal account that has prime. I get the same thing when using streamfab. If you try it outside of streamfab it will have an error when trying to play. I know they changed some endpoints and such so it might end up more widespread soon.
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