I've read the sentence:
The board of my company is not focus on employees
and I am wondering if it is correct.
I'd rather write "is not focused on" or "is not focusing on".
I do not find any case where "is not focus" is correct.
That might've been a typo. It sounds very odd to me. both of your examples are perfectly fine and correct.
"is not focused on" or "is not focusing on".
You’re right, that’s not standard English, and both your corrections sound good, depending on the context. I would assume someone made a typo or doesn’t understand when to use participles in English. If it is the latter, I have seen a lot of native speakers make similar mistakes, like “It is suppose to”. Maybe it’s because when speaking, a “t” sound following an “s” sound is often elided or pronounced too quickly or softly to be heard.
Most likely the correct should be "does not focus on" if we are speaking about focus in general, or "is not focusing on" if this it taking place for a period of time.
You could also say "is not focused on" if you convey a present situation likely to change. In my opinion, it has a slight "yet" to it.
For the noun board the correct tense of verb "to focus" would be focuses or does not focus for the present.
So you are correct in that is not focus is incorrect. Both of your examples sound correct.