Console warning on startup: `Could not encrypt access token Error: No token: not attempting encryption`

[richvdh]

Steps to reproduce

1. Open console
2. Reload element
3. Observe warning:

 Could not encrypt access token Error: No token: not attempting encryption
    persistTokenInStorage tokens.ts:131
    persistRefreshTokenInStorage tokens.ts:195
    persistCredentials Lifecycle.ts:899
    doSetLoggedIn Lifecycle.ts:863
    restoreFromLocalStorage Lifecycle.ts:623
    loadSession Lifecycle.ts:204
    loadSession MatrixChat.tsx:544

Outcome

What did you expect?

Less warnings

What happened instead?

warnings

Operating system

No response

Browser information

No response

URL for webapp

No response

Application version

No response

Homeserver

No response

Will you send logs?

Yes

[richvdh]

This is logged on every application load. It sounds very bad (my access token is being stored in the clear?) but actually I think it's harmless, and possibly because my homeserver is stock Synapse and hence not issuing refresh tokens.

It would be good to clarify the warning and maybe downgrade it (or remove it altogether).

[richvdh]

I think this was introduced by matrix-org/matrix-react-sdk#11249