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Hexadecimal numbers use 1-9 and the characters a,b,c,d,e,f (there are a total of 16 symbols, hence the name hexadecimal).
As you can verify yourself by looking back at your key, it contains non-hex symbols. Hence, you can realize that what you have there is not a hex number of length 64.
I would suggest you to search how can you convert your npub to a hex number and try again.
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