I have the answer now: I just needed to change the setting in the Audio MIDI utility.
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We have some great news for you – going forward, there will be no extra charge for HD as part of your Amazon Music Unlimited subscription.
You will continue to have full access to all of your HD content, but at no additional cost. This change will be reflected in your next billing cycle.
I cancelled Tidal (HD) soon as Amazon launched Prime UltraHD, been completely satisfied. Have the family plan, so everyone in the family can listen to whatever they want simultaneously in HD. Apparently pricing is becoming even more attractive.