Element Android does not share E2EE keys with other clients

[ManDay]

Steps to reproduce

1. Have a session in Android Element with everything (cross-signing, secure backup, encrypted rooms) in working order.
2. Log into Element Web )Element version: 1.10.4; Olm version: 3.2.8) , verify the new session with (for example) Emoji comparison.
3. Confirm your verification worked:
   
4. Observe Outcome
5. Attempt to Restore from Backup in Element Web.
6. A message about 600 keys being imported appears.
7. Observe Outcome
8. Attempt to Export E2E room keys on Element Android
9. Upload the file (565k) in to Import E2E room keys
10. Observe Outcome
11. Click Re-request encryption keys from your other sessions. in a DM
12. Observe Outcome

Outcome

What did you expect?

To be able to read other people's encrypted messages in DMs, like they show in Element Android.

What happened instead?

Messages from other people in two encrypted rooms do not show. Only a message

Unable to decrypt: You are not authorised to read the message.

Your phone model

No response

Operating system version

Android 9

Application version and app store

Element 1.4.0 [40104000] (F-d1e496624), Olm 3.2.10

Homeserver

matrix.org

Will you send logs?

Yes

[ManDay]

For the record: I tried to get this to work 3 times. Every time I deleted all sessions except the Element Android session, set up a brand new backup, exported the keys, waited for hours, etc.

Every time the same outcome.