E2EE Internal Error for iOS, PC/Mac works fine

[SaifAhmed7777]

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Steps to reproduce

1. Enable Serverside Encryption and E2EE
2. Enable on either Mac, Linux or Windows to generate a 12 word mnemonic
3. Input the 12 word mnemonic into the iOS client when enabling E2EE

Expected behaviour

For E2EE to be enabled. Worked perfectly on my Mac and Windows Client

Actual behaviour

It comes up with "Internal Error" see screenshot below

Logs

Nextcloud
https://pastebin.ubuntu.com/p/2vXRgnD2QK/

root@d7b5659d53a7:/# occ app:list
Enabled:
   - activity: 4.0.0
   - app_api: 5.0.2
   - bruteforcesettings: 4.0.0
   - circles: 31.0.0-dev.0
   - cloud_federation_api: 1.14.0
   - comments: 1.21.0
   - contactsinteraction: 1.12.0
   - dashboard: 7.11.0
   - dav: 1.33.0
   - encryption: 2.19.0
   - end_to_end_encryption: 1.17.0
   - federatedfilesharing: 1.21.0
   - federation: 1.21.0
   - files: 2.3.1
   - files_downloadlimit: 4.0.0
   - files_external: 1.23.0
   - files_pdfviewer: 4.0.0
   - files_reminders: 1.4.0
   - files_sharing: 1.23.1
   - files_trashbin: 1.21.0
   - files_versions: 1.24.0
   - firstrunwizard: 4.0.0
   - logreader: 4.0.0
   - lookup_server_connector: 1.19.0
   - music: 2.1.2
   - nextcloud_announcements: 3.0.0
   - notifications: 4.0.0
   - oauth2: 1.19.1
   - password_policy: 3.0.0
   - photos: 4.0.0-dev.1
   - privacy: 3.0.0
   - profile: 1.0.0
   - provisioning_api: 1.21.0
   - recommendations: 4.0.0
   - related_resources: 2.0.0
   - serverinfo: 3.0.0
   - settings: 1.14.0
   - sharebymail: 1.21.0
   - support: 3.0.0
   - survey_client: 3.0.0
   - systemtags: 1.21.1
   - text: 5.0.0
   - theming: 2.6.1
   - twofactor_backupcodes: 1.20.0
   - updatenotification: 1.21.0
   - user_status: 1.11.0
   - viewer: 4.0.0
   - weather_status: 1.11.0
   - webhook_listeners: 1.2.0
   - whiteboard: 1.0.5
   - workflowengine: 2.13.0
 Disabled:
   - admin_audit: 1.21.0
   - documentserver_community: 0.1.20 (installed 0.1.20)
   - onlyoffice: 9.6.0 (installed 9.6.0)
   - richdocuments: 8.6.1 (installed 8.6.1)
   - suspicious_login: 9.0.1
   - twofactor_nextcloud_notification: 5.0.0
   - twofactor_totp: 13.0.0-dev.0
   - user_ldap: 1.22.0

iOS Console
https://pastebin.ubuntu.com/p/VBBxDT6fP4/

Reasoning or why should it be changed/implemented?

It would be really important for security and privacy reasons

Environment data

iOS version: e.g. iOS 17.6.1
iOS 18.3.1
Nextcloud iOS app version: see More > Settings
Nextcloud 6.2.7
Server operating system:
Ubuntu Server 24.04.2 LTS Noble
Web server: Apache, nginx
NGinx version 1.26.2
Database:
MariaDB version “11.7.2-MariaDB-ubu2404”
PHP version:
I don't know, installed via docker compose
Nextcloud version: see Nextcloud admin page
Nextcloud Hub 10 (31.0.0)

I believe the app is buggy as on my desktop clients it works absolutely fine, and I have tested the E2EE on a web browser on my iPhone and it worked fine as well. I have Tailscale VPN with HTTPS enabled giving me the ability to have a valid LE certificate.

[marinofaggiana]

please update to last version of Nextcloud iOS, now 6.4.0, then, if error, please post the iOS Communication.log