"Key set not found" for user in encrypted video room

[menturion]

matrix-js-sdk: latest dev branch
matrix-react-sdk: latest dev branch
element-call: latest dev branch
LiveKit: 1.6.1

Steps to reproduce

I am getting the following error in encrypted video rooms:
livekit-client.e2ee.worker.mjs:1113 TypeError: key set not found for @john:domain.com:GPPDFBOMUK at index 0

(It seems that) the key is not set here ...

element-call/src/livekit/useLiveKit.ts

Line 79 in 0f38445

(e2eeOptions.keyProvider as ExternalE2EEKeyProvider).setKey(

Outcome

The consequence is that users can join a video room but video and voice do not work in group calls.

All group calls work fine in a video room if the encryption is disabled for that room.

Operating system

All

Browser information

No response

URL for webapp

No response

Will you send logs?

No