I don't have an EIN at all. My 1099-misc from my investments is for some reason "requiring" one and I can't get around it. Turbotax just keeps taking me in circles.

If you have a 1099-Misc, there should be an EIN on it from the entity that issued it.  It is listed as the Payers TIN on the form, directly below the payers name. 

Delete the form 1099-MISC

Click on Tax Tools on the left side of the online program screen

Click on Tools

Click on Delete a form

Note - There may be multiple pages of your tax return forms and schedules so click on the page number or right arrow (>) shown at the bottom of the federal tax return forms.

Then re-enter the Form 1099-MISC using this procedure -

Click on Federal (Personal using Home & Business)
Click on Wages & Income (Personal Income using Home & Business)
Scroll down to Other Common Income
On Form 1099-MISC, click the start or update button

On the screen Did you get a 1099-MISC?, click on Yes
On the screen Let's get the info from your 1099-MISC, enter the amount received in box 3 and continue
On the screen Describe the reason for this 1099-MISC, enter a reason and Continue
On the screen Does one of these uncommon situations apply? - Select None of these apply and continue
On the screen Did the (reason) involve work that's like (your name) main job - Select No and continue
On the screen How often did (your name) get income for (reason) - Select 2025 and continue
On the screen Did the (reason) involve an intent to earn money? - Select No and continue

The amount entered from the Form 1099-MISC will be entered on Schedule 1 Line 8z
The total from Schedule 1 Part I Line 10 flows to Form 1040 Line 8

On the Form 1099-MISC an EIN would be entered in the box for the PAYER’S TIN.  Your Social Security number should be in the box labeled RECIPIENT’S TIN