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Dragon Empress
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It's possible the ISBN isn't showing up because the book isn't live yet. The files are still being processed through IngramSpark, so there aren't any purchase pages on retail websites yet. This should be fixed on Monday when the files are approved!
Whether an ISBN is valid (that is, whether it meets the check digit test) has nothing to do with whether it is currently available for sale.
An ISBN-10 is not just an ISBN-13 with the first 3 digits removed. The last digit (aka the check digit) must be recalculated. The various online ISBN converters are the best way to do this. One of them is how I know the last digit of the ISBN-10 was incorrect. I have fixed it.
An ISBN-10 is not just an ISBN-13 with the first 3 digits removed. The last digit (aka the check digit) must be recalculated. The various online ISBN converters are the best way to do this. One of them is how I know the last digit of the ISBN-10 was incorrect. I have fixed it.

Oh, there are lots of them. It is also possible to calculate the check digit manually, but I much prefer to use a converter.
Many thanks in advance!