Nextcloud zimlet problem with integration

[libor.tyml]

Hi to all,

please I follow the step by step manual for Nextcloud zimlet integration:
https://zimbra.github.io/zimbra-9/admin ... _nextcloud

All seems to work, but when I will activate the session from zimbra to nextcloud. The activation from zimbra to nextcloud wont accept the session.

Zimbra server:
Ubuntu Server 18.04
Zimbra Server Version 9.0.0_GA_4000 (build 20210121015428)

Nextcloud:
Ubuntu Server 20.04
Nextcloud Server version 21

Many thanks for reply

Libor