We each received a separate, but identical W2. They're input separately as well, and we've definitely chosen to file as married filing jointly. I've deleted and re-added the W2s but that did nothing.
I found an answer to this question in another thread! Essentially, raising my W2 by $1 and lowering my wife's by $1 did the trick. Link to other thread --> https://ttlc.intuit.com/community/taxes/discussion/turbotax-says-my-return-was-rejected-because-of-duplicate-w-2s-it-is-not-a-duplicate-my-husband-and/00/2138444
To correct this situation, please follow these two steps:
For more information, see: How do I import or enter my W-2?