If you are unable to retrieve your W-2 from your employer, you can contact the IRS to contact your employer to request the missing W-2. Another option is to complete a substitute W-2 by filling out Form 4852 in TurboTax.
Refer to the IRS article What to do when a W-2 or Form 1099 is missing or incorrect for more information.
Refer to the TurboTax Help article What To Do If You Haven't Received a W-2.
Another option is to request a Wage & Income Transcript from the IRS. For more information, refer to the TurboTax article What is an IRS Tax Transcript and How Do I Request One?
Refer to the IRS article for instructions; Get a tax transcript online.