proxmox with external ceph cluster and EC pool

[FiveAces]

I have set up a Proxmox 8 ceph cluster with an EC pool called tsPool1.
Now I want to connect an independent standalone proxmox 8 host to that cluster using rbd.

I used the GUI Datacenter->Storage-> Add feature to setup the storage.
The storage is created but I only get a connect when I use the pool tsPool1-metadata.
However, the host->Storage->Summary reports the wrong pool size (3.2TB) where the ceph cluster in host->Storage->Pool->summary shows 5.6TB.
Using this setting I can still create rbds and setup and run a VM.

But I am suspicous that the data goes into the place.

When I compare the /etc/pve/storage.cfg of a ceph host to the single host I find differences:

ceph:

rbd: tsPool1
        content images,rootdir
        data-pool tsPool1-data
        krbd 0
        pool tsPool1-metadata

single host:

rbd: rbd
        content images,rootdir
        krbd 0
        monhost 10.10.8.201
        pool tsPool1-metadata
        username admin

I have setup one VM directly in the ceph cluster (rbd 32GB) and one in the single host (rbd 32GB):

the GUI of the cluster node->Ceph->Pools reports:

So apparently the data of the single host goes into the wrong pool.

My question is how can I properly connect to an EC pool from an external host and create rbds?