So I've seen others with this issue but the suggested solution didn't help. So here's the rundown.
I have a fairly new Verizon account (started in April) with a brand new phone number. I can text just fine to all numbers except my realtor.
Her number, when I try to send gets a "failed to send" error. She can text me and I get her messages. When I try to reply "failed to send" over and over again. All other contacts I've tried to text work find. I'm not blocked as far as she knows (she certainly didn't set up a block). And she can send messages to me. My husband can text her just fine.
I've tried adding a 1 in front of her number, doesn't help.
Really need this issue fixed, couldn't be a worse person to not be able to text with.