So my situation was a little different since I was using a work laptop and Inseego MiFi hotspot and my work laptop is using Cisco AnyConnect Secure Mobility Client VPN. My work laptop locks down Network Preference Properties behind an admin account so I couldn't access any settings there. And the VPN only utilizes IPv4. However, I was able to get the Cisco VPN to work by logging into Inseego Web Admin panel. Once there, I navigated to Settings -> Advanced -> LAN -> IPv6 and unchecking the IPv6 box. Hope this helps someone!
I also developed the same issue recently. I recently purchased an unlocked Pixel 6 and transferred my SIM card between devices. I live in an area with no cell coverage and every time someone attempts to send me an MMS message, I cannot download the message until I either restart my phone (only works sometimes) or drive to an area with cell coverage.
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