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You need to contact Adobe Support either by chat or via phone when you have serial number and activation issues.
Here is a link to a page with options to help make contact:
You need to take this up with Adobe Support. Only they can resolve if the
key is correct and they will be able to confirm that.
In addition to what others have offered, note that it's an age old conundrum that we find ourselves typing the digit 1 instead of the upper case letter I or lower case L and the letter O for the digit 0. So you might carefully scrutinize what you were given as opposed to what you were typing.