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GrapheneOS does support E911, but not the recently added Android Emergency Location service which is not standard and not required for this. See https://news.ycombinator.com/item?id=43669766. Triangulation via the cellular network is an older method for when E911 isn't supported.

https://discuss.grapheneos.org/d/17097-is-it-still-the-case-...

Sorry, I'm a bit confused. That link seem to state the opposite? The user is asking if 911 can still override the location settings on the phone, and the answer seems to be "yes."

https://github.com/GrapheneOS/os-issue-tracker/issues/1174

Here in Australia, it didn't work the couple of times I called.

The first question asked each time was which state I was in.

You probably don't have network-based location enabled. Satellite-based location doesn't work well indoors and takes a while to get a lock. Network-based location support was recently added to GrapheneOS and is opt-in. See https://grapheneos.org/features#network-location and https://grapheneos.org/usage#network-location.