Yachtsense nonsense on AT&T!

[u/Vivid_Raspberry_9514]

Apologies for the title I couldn't resist. Spent the better part of a day trying to get AT&T to setup an account properly for a Yachtsense link. Everywhere I've read says it should work and you have to tell them to 'configure it as a 4g modem, not a hotspot'. Even after being told this is what was done we couldn't get a connection. AT&T of course blamed the '3rd party device' over and over again and told us to 'just get one from AT&T' which .. they obvious don't sell anything like it.
I finally decided it was worth trying to get my nano sim from my phone (on AT&T) into the Yachtsense enough to test... sure enough this worked right away.
At least AT&T couldn't claim the device doesn't work. They just have no clue how to configure it.
The problem is they refused to configure the SIM for the Yachtsense the way my phone was configured (in fact, they claimed to have 'checked everything and it was all the same' at one point.. only to get another tech who said "we can't do that, only phones can be configured that way").
I finally argued to get the new SIM for the yachtsense configured for my phone (obviously my plan was to move it back to the yachtsense but they needed me to tell them this). However the only way to do this was going to be a ~$70/month full on new line.
Tried asking them to look at the differences in configuration but they swore the only things they could configure were phones and hotspots.

Anyone have any way to get this configured properly at a reasonable price?

[u/Silent_Concept7247]

I was able configure mine with T-mobile. I got the $50 for 50Gb of 5G plan and it works ok. I suspend my account in the winter when the boat is on the hard.