The embryo room has been bought, but I haven't checked in yet. The key has been in the property. Do you still need to pay the property fee? What is the basis of payment? thank you

From the date you buy a house, whether you check in or not, you and the property have formed a contractual relationship according to the property management agreement.

So you need to pay the property fee from the date of buying a house, but you have never moved in, which is applicable to the "vacant house" standard, so you can pay 70% of the total amount (this ratio varies from place to place).

The property company has no right to detain your key, even if you don't pay the property fee, it is a common charging method for property companies, so there is no need to entangle this issue.