- Allow application services to masquerade as specific devices belonging to users, as per [MSC4326](https://github.com/matrix-org/matrix-spec-proposals/pull/4326). ([#2221](https://github.com/matrix-org/matrix-spec/issues/2221))
- Add the `m.oauth` authentication type for User-Interactive Authentication as per [MSC4312](https://github.com/matrix-org/matrix-spec-proposals/pull/4312). ([#2234](https://github.com/matrix-org/matrix-spec/issues/2234))
- Add the `m.oauth` authentication type for User-Interactive Authentication, as per [MSC4312](https://github.com/matrix-org/matrix-spec-proposals/pull/4312). ([#2234](https://github.com/matrix-org/matrix-spec/issues/2234))
- Allow application services to manage devices and register users without the legacy authentication API, as per [MSC4190](https://github.com/matrix-org/matrix-spec-proposals/pull/4190). ([#2267](https://github.com/matrix-org/matrix-spec/issues/2267))