You would need to contact Coinbase to get a revised 1099-K. you can file your return with what you have knowledge of and indicate amended 1099 was received when filing and wait to get the revised 1099..... Or you can file for an extension until the new 1099 comes in , Just make sure to pay your tax liability by 4/15.
**I don't work for TT. Just trying to help. All the best.
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**Mark the post that answers your question by clicking on "Mark as Best Answer" I am NOT an expert and you should confirm with a tax expert.