Widevine setting is an Enabled / Disabled switch, here:
brave://settings/extensions
Brave Support will need to know:
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your versions of Linux / Ubuntu
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your version of Brave Browser
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have you specifically toggled the widevine switch — and what happened as a result
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might your firewall(s) be thwarting some port number needed by Amazon in order to communicate well with your computer
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specific Shields settings that you have attempted / tested in order to figure out on your own, what might be the hangup
brave://settings/shields
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are you using the Simple or Advanced view?
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what are the specific Shields settings that you normally leave all such switches set to
You get the idea.