"Failed to open requestet file"


I try to install MS Office Integration with Nextcloud.
My Config are:
Windows 2016 Server
Nextcloud 24.0.7

I follow the Instruction to install MS Online Server:

It shows me the right answer when I open https://server/hosting/discovery

I use SSL Cert. on both Servers
I also set the RegKey for TLS on the Server

I enter the Office server under Settings/Office online in Nextcloud. It shows me a green ok but If i select it the second time it shows: “Could not establish connection to the Office Online server.”

What I was wondering: I have not to enter any login information for the Office Server.

hope you can give mit a hint


okay sorry.
Looks like a has a DNS-Misconfig.