What is one of the key problems (at least according to some critics) with ""Mind-Brain"" Identity Theory?

Mind-Brain theory is completely dependent on psychology and only can be elaborated in terms of psychology.

Our mind is just a part of the brain. The mind is the mental condition of a human being and the brain is physical part of the body.

The key problem is that the Mind can be operated without brain instruction and the brain instructions are dependent on the environment.

Although the Mind and brain are the same the command, process, and functionality are different.