Thanks for the quick response. I tried various dates, and it finally accepted 12/1/2023. Next question asks how many months did I use this home office, and it allowed me to enter 12 there. I later opted for Simple Office Deduction rather than itemized, which hopefully makes these kind of details less critical.
re your suggestion about Forms, I am using online, so I don't think I have a Forms mode available. I didn't enter this under office assets, it was the questionnaire that pops up after selected Home Office expenses.
