Does anyone else have issues with wifi-calling while flying with Delta? I sign on with the free skymiles internet, but then my wifi calling from t-mobile doesn't work.

I remember it used to work when I was paying for a monthly gogo subscription, but I'm not sure if they block wifi calling now? I want to use it for texting (I'm on Android), and sometimes need it for verification codes, but I keep getting error code ER081 when trying to connect. Has been happening for the past year.

I escalated with t-mobile and they said the times I mentioned trying to connect and I couldn't, they didn't show any attempted connection on their end, which meant it was being blocked somewhere along the chain.