As the other reply said, your employer has handled this wrong. The income should have been added to your W-2. FICA (social security & medicare) tax should be paid on this income, which means you should treat it as self employment or go back to your employer for corrective paper work.
That said, the key to getting TT to treat it as other income is to follow these steps (this is probably what you did in the past):
Enter the 1099-Misc
On the next screen Describe what the payment was for
On the next screen select "none of these apply"
On the next screen select "No it didn't involve work like my main job"
On the next screen select "I got it in 2020" ONLY
On the next screen select No, it didn't involve intent to earn money
TT will put the amount on line 8 of Schedule 1 as other income
