I have the exact same issue with the Sagecom. I use IKEv2. I posted about it here https://twitter.com/alexhoop27/status/1610346791509147649 and here https://www.reddit.com/r/tmobileisp/comments/zz8v3d/vpn_issues_with_sagecom_fast_hub/. T mobile support was abysmal, so I took the liberty of researching it myself, and what I found is that the T Mobile router is blocking inbound ESP (Encapsulating Security Payload) packets, which means that even though I’m “connected” to the VPN, and am requesting webpages and such, no information ever makes it back to my computer. Dear T Mobile, PLEASE fix this, or at least look into it, instead of dismissing it as a “third party” issue. It is not. Thanks, hooperdev! After I posted the issue, I went to a store to ask if they have the Nokia model, the store associate was not supportive to my idea of changing model, but they made a call anyway and found that the Nokia model is out statewide (I am in CO). I guess we need to voice up for this issue and
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