I was trying to solve the same issue today and i figured out why. when you recieve the validation sms it comes from number 99999999 and when you reply to it, it will go no where. if you reply back manually to the alert central email address you created, it gets there but cannot validate because it is now an mms and not a sms. the way to spoof it is to spoof your phones sms email address and send the validation. for example from is 5554441234@msg.verizon.net and the to is alert.central@yourcompany.com and the subject will be {ANCID:3345} with the body verified. you will know exactly the values to put in. This will work to only receive the sms, however you cannot ack them back.
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