Which features support end-to-end encryption for one-to-one Teams calls?

This is partially correct but incomplete as video is also supported by end-to-end encryption for one-to-one calls.

This is partially correct but incomplete as audio is also supported by end-to-end encryption for one-to-one calls.

Teams chat has its own encryption mechanisms (encryption in transit and at rest) but is not covered by the E2EE feature for calls.

Microsoft Teams end-to-end encryption (E2EE) for one-to-one calls is specifically designed to secure the audio and video streams. This feature ensures that only the communicating parties can access the call content, protecting the privacy and confidentiality of their conversation.

While chat is encrypted, it is not part of the one-to-one E2EE for calls, which specifically covers audio and video modalities.