Unable to use T-Mobile Home Internet with work VPN, any suggestions?

I have been working on T Mobile for a year through my company's Sonic Wall Net Extender VPN. No issue at all. UNTIL May 1st 2024, it broke. My IT department has tried everything. They are trying all sorts of things. Between the time they have lost, and the time I'm behind in my work, I've just about resigned myself to having to get rid of TMobile. It's really been a great service, but if I can't work from home, it's useless. T-Mobile doesn't even try to answer. I experienced what y'all did, four different calls, four different answers. I can't understand why it all went haywire just like that.