Get your taxes done using TurboTax

I didn't realize that there was federal income tax withheld from your disability pay. At this point, if your employer won't cooperate and send you the corrected W-2, you would need to  follow the instructions from the IRS here, where you can either call  the IRS at 800-829-1040, or make an appointment at an IRS Taxpayer Assistance Center.  

The link to the IRS says that they'll send you instructions to file Form 4852, Substitute for Form W-2, but you can do that in TurboTax. 

Instead of entering your incorrect W-2, you would: 

1. Go through the W-2 section, and as you said in your original question, add those missing items into the appropriate boxes. 
2. Then, as you continue, you'll reach a screen: Let's check for uncommon situations. Check off Nonstandard W-2 (handwritten, modified or altered) and  Didn't get a W-2 (manually calculate my earnings)
3. The next screen, Let's check if you need a substitute W-2, will tell you that you need to make every effort to obtain the W-2 from your employer. You'll check Yes, you still want to complete a substitute W-2. You will acknowledge that you have received an incorrect W-2 and that you've notified the IRS, and that your amounts are the best estimates of your wages for the time period.
4. Proceed to describe the efforts you've made to obtain the correct W-2 and how you came up with your figures. 

These instructions say that you can't efile with Form 4852, you have to print out and mail your tax return. I have seen information that you actually can efile if the Form 4852 has been completed according to the rules. If TurboTax will not allow you to e-file, you'll have to print and mail. 

Another alternative is that if you feel that the employer will cooperate, but not before the April 15 deadline, you could file for an extension until October 15, 2025 to file.  It's not an extension to pay your tax, though, so if you will have a balance due with your return, you'll need to pay it by April 15, 2025. I'm sorry you are having this experience.