Need help connecting to WIFI Calling-Error (EDS0008)

I purchased an unlocked international Samsung Note 9 that was manufactured originally for Verizon. Yet is compatible with all networks, including GSM. I use AT&T as my provider and inputting my SIM card it fired right up with no issues except for one :-( It will not connect to wifi calling. I contacted the 800 number for AT&T that the error message told me to contact to have the necessary account changes made. This did me no good after a lengthy call. They told me the problem must be due to not being an original AT&T phone. That makes no sense to me...why should this make any difference? All of my other unlocked phones connect to wifi calling with no issue. I love the phone but we get lousy service in our home and the use of wifi calling is a major need. AT&T said they would have someone in IT contact me within a couple of days...that was two weeks ago and of course no contact. Any assistance on this matter would be greatly appreciated.
 
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