To make a long story short if your company support dual stack IPv4 and IPv6 you should be fine. Unfortunately, my case is that they only support IPv4. The solution to my case is to disable my laptop IPv6. However, it does have some side effects. Hence, discuss it with your IT team before you do so. Good luck.
I have been worked on this issue since 06/06/2022. It looks like the problem is not on the Cisco AnyConnect or T-Mobile but on the IP protocols. Last night I have succussed in fixing “the site is not available” due to the DNS server. I will get back to this issue after more tests.
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