Encryption upgrade fails to fetch keys from backup

Description

During first login on riot-web 1.16 (or subsequent “Restore keys from backup” or similar actions), the client fails to fetch keys from the server. The GUI keeps spinning on “Fetching keys” and nothing happens.

Steps to reproduce

• Log in with account that has key-backup enabled and member of some encrypted rooms before the new E2EE.
• When prompted to upgrade encryption, enter the account password and press OK
• The wheel spins and nothing happens. In the console of the browser this message is seen: restoreWithCachedKey failed: Error: "Couldn't get key" restoreKeyBackupWithCache https://riot.midlertidig.online/bundles/9f769ac7a648e2ec9507/vendors~init.js:2

Log: sent

Version information

• Platform: web (in-browser)

For the web app:

• Browser: Firefox 75.0
• OS: Windows, Manjaro
• URL: Private server, running riot-web version: v1.6.0

[bergmannf]

For me it was working when setting it up on the RiotX Android App, but once I try to set it up on the desktop application (Fedora using the Flatpak) it will go into a loop asking about the account passphrase.

It never asks about the key backup passphrase only the account password.

I also can’t verify the session from my other device - after confirming it with the Emoji method it will say “The other party cancelled the verification.”

When trying to use the website I can also see that the POST to https://matrix-client.matrix.org/_matrix/client/unstable/keys/device_signing/upload returns a 401 - Unauthorized.

[DarwinAwardWinner]

Also, this might be a separate bug, but if I press “skip” and then “go back”, I end up here, which is definitely not back where I was before: