Unlock bought from Amazon not working

Hi, I bought app unlock from amazon in 2015 Amazon.com order number: D01-3689598-0897838
and worked well on my old device Lenovo K3 but now in my new Redmi Note 5 unable to instal from Amazon and Play Store shows have to buy it. Before it was ok to instal from Play Store as bought so free. Tried uninstal from old device and reinstal to the new and didn’t work. Tried to instal from desktop Play Store and didn’t work. Shows have to pay again. Thank you for helping me.
PS: mohu psát česky?

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