Why do you have the word "office" in quotation marks?
Well...there are two possible scenarios here: you make it known that you are going to record the conversation or you make the recording without letting the other party(ies) know you are doing so.
In the former instance, I would hope it patently obvious that anyone can refuse to have a conversation with you if you seek to record the conversation. In the case of your employer, you could legally be fired if you refuse to proceed with a conversation without recording it.
On the other hand, if you don't inform the other party(ies) that you are making the recording, then it should be equally as obvious that those other party(ies) have no ability to take action based on knowledge they don't have.
I would not call it a legal right, but Minnesota is a so-called one-party consent state, so it would not be illegal for you to do so.
Why do you have the word "always" in quotation marks? Regardless, there are numerous reasons why a supervisor might need or want another person present when speaking with a subordinate about certain matters, and none of those reasons are applicable to the subordinate. Why would you think you need a witness or recording?

