Don’t know where your company is currently located?
There should be an office address.
You can first go to the industrial and commercial department to register a change of address, change the company's address to the actual office location, and then apply for tax registration.
If your company does not need a real office location, then you can communicate privately with the tax administrator. After all, it is not a big problem. The Industry and Commerce Bureau has issued a business license, so why is he pretending? Probably just trying to figure something out.