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I have a 21 number code on my Turbo tax from Costco and it will not accept it.

Please see the link for CD/Download that is applicable for the 21 digit code:

https://turbotax.community.intuit.ca/community/product-information/help/where-can-i-download-the-cd-...

the code I received when I purchased the standard online version from costo shows up as invalid when I enter it

We're sorry to hear you are having this issue. To help you we will need more information. Therefore, could you please meet us by private message on Facebook or Twitter to see how we can help you further?