It depends. What type of EIN did you apply for on your application. Did you say you were a sole proprietorship or partnership?
In general, every domestic partnership must file Form 1065, unless it neither receives income nor incurs any expenditures treated as deductions or credits for federal income tax purposes.
If you filed as a sole proprietorship and intend to report your 2022 income and expenses as self-employed (Schedule C) then you can file as self-employed in 2021, include your EIN number and deduct expenses.
As @Mike9241 said, it doesn't appear that you have any deductible expenses in 2021 since you were not in business.
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