I swear I checked every single letter. Steam says the codes should be like 'xxxxx-xxxxx-xxxxx' or they might look like 'xxxxx-xxxxx-xxxxx-xxxxx-xxxxxxxxxxxx xx' but mine is 'xxxxx-xxxxx-xxxxx-xxxxx-xxxxx'
I would type my key on here to prove how it looks nothing like Steam's format, but that's against the rules.
This doesnt help you at all, but a small correction
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Keys look like the following:
xxxxx-xxxxx-xxxxx
or
xxxxx-xxxxx-xxxxx-xxxxx-xxxxx
or
xxxxxxxxxxxxxxx xx
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your "'xxxxx-xxxxx-
xxxxx-xxxxx-xxxxx'"' key is the right format.