Fixed rejected return, resubmitted, and now my return says pending for over 72hrs on TurboTax but it's has not received it yet

The official start date for the IRS to start processing tax returns is January 29, 2024.

Your tax return was pulled early from a small batch to test the IRS systems before the official start date.

If you re-filed after a rejection, then you went back into pending and will be waiting with the other millions of returns that are in pending, waiting for the IRS to accept/reject returns on January 29.