You should be able to enter home office expenses with $0 income in TurboTax. The IRS will not let you create a loss with home office expenses, with the exception of home mortgage interest and property taxes.
Those are deductible home office expenses that are not limited to income from the business.
Try entering $1 for business income. See whether that let's you into the section. Any suspended deductions are carried forward to next year.
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