Not sure if you've resolved this yet, however after much backwards and forwards with Ohme, they have come back with the following.
"Tesla has potentially changed the control line voltage thresholds to a tighter specification than the international standard.
We have already developed new hardware that we believe will resolve this issue with new Tesla model's and have had success with one other customer that had the same issue with a 2020 Tesla."
haha i'm wondering if i'm the one customer
Ohme shipped me a new charge point which arrived over the weekend. One of the Octopus installers came by Monday morning and swapped out the charge point - just the unit, none of the other wiring. Took him under an hour, and it worked immediately.
So yes - my issue is resolved, and it clearly was an issue with the charge point. So it was either defective or the new one has some updated firmware (although they should have been able to push that out via a firmware update remotely, no?).
Hardware 'looks' identical, but who knows - maybe the innards are different?
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