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Could be... however the app itself has been really flakey.Same issue as here it looks like?
Thread '2021.44.30.1 Issues with Tesla App functions?'
2021.44.30.1 Issues with Tesla App functions?
I don't think it needs a connection to Telsla servers to open funk or charge port remotely. The phone app can do this remotely via BT.I am confident it was not an LTE issue.
The car was in my garage and I have a good WiFi connection. Some functions were still working remotely (such as opening the frunk or the charge port) so it definitely had a connection to the Tesla servers.