Why can't I block a number on a line?

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I have (3) lines, and I'm trying to block a number from calls/texts via the my Verizon portal. It allowed me to block it for 2 of the lines, but  for the 3rd, it tells me "We were unable to block xxx-xxx-xxxx on these devices" and lists the 3rd device. Why is is not allowing this number to be blocked on my 3rd line?

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