Remote backup doesn't work - No folder found

Dear WD Community,

I’m having a problem with 2x My Cloud EX2 Ultra
I’m trying to setup the remote backup from SRV1 to SRV2 in a local network.

I tried everything. I tried for many hours to make it work but it doesn’t.
I’m stuck here without any error and it drives me crazy.

I’ve try to:
Setup both SRV on static IP
Activate port forwarding on both SRV
Activate port forwarding on the router
Reset system of both SRV
Change password for backups and SSH
Checked that the ssh password is working by connecting to SSH
Ping both SRV from SSH, 100% working
Activating SSH on both SRV
Activating RemoteServer on both SRV
Update Firmware on both SRV to 2.31.149
I’ve try the setup on 3 different browsers to see if it was a browser issue

The only thing I might not have is a UPNP router.

I’m lost and I don’t know what to do.

Any help ?
What can I do to solve the problem ? How to diagnose where the issue is ?

Best regards

@techsupport You may want to place this topic in this sub-forum.

https://community.wd.com/c/network-attached-storage/wd-my-cloud-ex2

Did you ever find a solution? I’m also stuck searching for the destination folder.