Ask for the pair's end-to-end encrypted (OMEMO 2) room
rather than their plaintext one. Defaults to false.
A pair can hold both: the encrypted room is a separate
room whose name carries an -e2ee suffix. So calling
this with e2ee: true for a pair that only has a
plaintext chat creates the encrypted room alongside it -
it does not convert the existing one, and the plaintext
history stays where it was written. Idempotent per
variant: a second call with the same e2ee returns the
room already created.
Encrypted rooms stay encrypted for their whole life.
There is no endpoint that clears the flag, so neither
member can silently downgrade the room under the other.
Requires the app to have e2eeEnabled: true
(PUT /v1/apps/{appId}, reported by
GET /apps/get-config). Otherwise this answers
403 E2EE_DISABLED, including for B2B callers - the
plaintext room for the same pair is still creatable.