What information are you missing on your 1099-B? If you can clarify, we'll try to help.
You could reach out to both brokers for the info you need, and see if they have any supplemental statements that may contain that data.
Basically, you just need Date Acquired (which can be Various), Date Sold, Cost Basis, and Sales Proceeds to enter your 1099-B in TurboTax.
Here's more info on How to Enter 1099-B.
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