Wrong ACLs in shared Imap Folder

I created a shared Imap- Folder and set acls for two users:

As result i can subscribe this Folder as Admin, but i see wrong Access rights:

The User “stanzerei” is not able to subscribe to this folder. It does not show up in the Imap-Subscription list in OX.
When i setup the “stanzerei”-User in Thunderbird or any other Imap-Client i can see this Folder and subscribe to it but it still does not show up in OX afterward.

open-xchange log does not show anything related.

root@mail:/etc/dovecot/conf.d# univention-app info
UCS: 4.2-0 errata52
App Center compatibility: 4
Installed: mailserver=11 open-xchange-text=7.8.3-17-ucs1 oxseforucs=7.8.3-17-ucs1
Upgradable: oxseforucs

I hope you can help me to fix this.

Matthias Hütter

Have you looked at Settings→Email→IMAP subscriptions (button at the bottom)?

Sadly yes.

I think i found out the reason: Only Groupware and Premium Access-level has sharing functionality inside OX.

Thank you anyway