Hello,
first of all, I apologize for my broken english, I will do my best to express myself.
The second problem is, that I'm not an advanced server-admin or anything so i can only google an try (but found nothing helpful so far).
Server:
VPS Ubuntu 18.04.5 LTS 64bit
10 CPU vCores
48 Gb RAM
800 GB SSD
with Plesk Obsidian 18.0.31 (Key Typ "Plesk 12 VPS Web Admin" + addional key for "Docker Remote Node Management")
everything is updatet so far within Plesk and console (apt-get update && apt-get upgrade)
The server is new except Plesk.
I tryed to install the OnlyOffice Workspace via Docker:
Guide I followed: Installing all ONLYOFFICE Workspace components integrated - ONLYOFFICE
The first 3 parts are going fine and how they should.
After installing the last component (Community Server) Plesk threw me out with the following error:
Rollback for the Key doesn't help (or change anything).
Recall for the Keys leads to the following error:

After this I couldn't login to Plesk (Repair Kit is unavailable) and my only way to go is to stop the docker (service docker stop). After that everything works fine again.
This process is continuously repeatable.
I don't know what the problem is and how do I get it going.
The Server-Support (Strato) can't help and send me off to the Plesk-Support.
I hope someone can help me with this
first of all, I apologize for my broken english, I will do my best to express myself.
The second problem is, that I'm not an advanced server-admin or anything so i can only google an try (but found nothing helpful so far).
Server:
VPS Ubuntu 18.04.5 LTS 64bit
10 CPU vCores
48 Gb RAM
800 GB SSD
with Plesk Obsidian 18.0.31 (Key Typ "Plesk 12 VPS Web Admin" + addional key for "Docker Remote Node Management")
everything is updatet so far within Plesk and console (apt-get update && apt-get upgrade)
The server is new except Plesk.
I tryed to install the OnlyOffice Workspace via Docker:
Guide I followed: Installing all ONLYOFFICE Workspace components integrated - ONLYOFFICE
The first 3 parts are going fine and how they should.
After installing the last component (Community Server) Plesk threw me out with the following error:
Translation:Fehler: Der Lizenzschlüssel ist ungültig. Um Plesk verwenden zu können, müssen Sie einen neuen, gültigen Lizenzschlüssel anfordern und installieren. Der Lizenzschlüssel ist nur zur Verwendung für Plesk innerhalb der folgenden virtuellen Umgebungen gedacht: Container von Virtuozzo, VMware, Microsoft Hyper-V, Xen, KVM, Virtuozzo-Server, LXC, Docker.
Error: The license key is invalid. In order to use Plesk, you must request and install a new, valid license key. The license key is only intended for use for Plesk within the following virtual environments: Containers from Virtuozzo, VMware, Microsoft Hyper-V, Xen, KVM, Virtuozzo-Server, LXC, Docker.
Rollback for the Key doesn't help (or change anything).
Recall for the Keys leads to the following error:

After this I couldn't login to Plesk (Repair Kit is unavailable) and my only way to go is to stop the docker (service docker stop). After that everything works fine again.
This process is continuously repeatable.
I don't know what the problem is and how do I get it going.
The Server-Support (Strato) can't help and send me off to the Plesk-Support.
I hope someone can help me with this