What is the legality of recording a conversation over the phone with my employer?

Question Details: I was fired from my job due to a FMLA request that was denied. I had requested a personal leave of absence to cover the situation I was in. I had a bunch of my teeth smashed/crashed/destroyed by 2 people at a gas station slamming my face into the ground. I needed to go to an urgent care dental place to have it worked on. I had teeth removed or fixed. I had very infectious abscesses that can kill you. The urgent care place didn't have a doctor, they give urgent dental care, so they didn't/wouldn't give me documentation stating that I could miss work to get this worked on. I had asked my director if it was alright to get this worked on 2 days after it happened as I showed up to work with a bunch of busted up teeth and swollen mouth because of the massive infection flaring up in my mouth. They told me that I was fine, to go home and to not worry about work until I had it all resolved. I called HR the very next day to talk to them about getting everything finished/set up. They said that I would have to talk to the FMLA source to deal with the situation to protect my job. I knew FMLA was not going to be able to do this kind of situation, so I told both HR and the FMLA source that I needed a personal leave of absence. I was told that I could not return back to work until I was given a release form stating I could return to work which the dental care place wouldn't give me since they don't have the ability to do so because they are just a urgent dental facility. It's not like the hospital. So I was told that I would be fired from work on Tuesday if I did not provide either the excuse to miss work or a medical release form stating that I could return, both of which is impossible to supply to them. I offered to show them the bills and payments I had for that job and they absolutely refused, saying they won't accept it even though they prove that I had the work done on my mouth. I want to record the conversation of them denying to accept that, in the instance they try to deny my unemployment or say that I abandoned my job. The reason being is they want me to come into work on Tuesday to "talk about it". I work in security there, I know how that goes. I come in, we have the same dumb conversation ending with them denying anything I give them and then them saying they are firing me and having security escort me off the property, humiliating me for something that is out of my control. I want to record it for my protection in the instance I ever need to take it to court.

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