Problem using Collabora Online in NC

Hello,

I’ve installed Nextcloud via my Webhoster and added the app Collabora Online and the Collabora Online Built-in CODE server. Unfortunately, I can’t open / save my documents.
I get the following error messages when I try to open the document:

"Failed to load Collabora Online – please try again later”

When trying to install the server using the Collabora Online Built-in CODE server I get the following error message:

“Could not establish connection to the Collabora Online Server”

I made a message to the support team of my Webhoster but they couldn’t help me.

Thank you for your help!