need some help--- need a key for rental

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This is my first time posting. I became involved in property management because of my husband. He died in the last year but was managing the rentals. I enlisted help from a property management company.  since my husband was managing it, I don't know where a key is for the home, his death was unexpected and fast so we never discussed it and he wasn't very organized with that kind of stuff. 

I have asked the property management at least 7 times to get me a key and they still haven't. Today I emailed the tenant and asked them.

It's frustrating and a strange problem. I'm not sure what to do. Any ideas?