ESA letter medical provider question

[Troy L.]

Hi everyone,  A tenant has brought to my attention she wants a esa for medical problem at sfr I rent to her.  So today I get a text with a picture of letter from an alleged medical provider (DNP-C).  Missing from the letter was date written, letterhead, liscense number and signature.  So l text back tenant and ask if she could have provider resubmit letter with missing info and she replied she would.  I then asked her to please tell me the providers physical business address, twice and was not given ananswer.  I have read online that medical providers must reside in the same state as patient and also that they don’t.

Does anyone know for sure if it is required for provider to be in same state or not?

Does each state have its own laws concerning this?

Thanks in advance!