Is it illegal for intellectual property management departments not to provide patent search reports?

Illegal. The administrative department of intellectual property rights may punish those who do not provide patent search reports. According to the Patent Law of People's Republic of China (PRC), any unit or individual who exploits another person's patent shall conclude an exploitation license contract with the patentee and pay the patentee the royalties. The licensee has no right to allow any unit or individual other than those stipulated in the contract to exploit the patent. Therefore, if enterprises or individuals do not provide patent search reports, they may violate relevant laws and regulations and be punished accordingly.