Does My Home Office Fail Excusive Use Test

[messner8000]

I worked as a W2 employee for all of 2021.  I worked from a room in my house. For December 2021 I started my own business, which I ran from the same room in my house.  Let's say I used the room 50% for my W2 work and 50% for my own business in December 2021.  Can I claim the home office deduction if I enter 50% for Percentage of Business Conducted at my house? Or can I not claim anything because I fail the Exclusive Use requirement (because I perform my W2 work in the same office)? 

[AliciaP1]

No, you cannot claim the home office deduction for 2021 because under these circumstances you fail the exclusivity test.