Document loading failed - Failed to load Nextcloud Office - please try again later

I want to install collabora and after some of search i found that i can make a contianer for collabora with it’s own domain and hook it up with nextcloud so i did that but now each time i try to eidt a document i get this error in title, and no error logs in NC or docker image itself

PS: i followed this guide


thanks to [SOLVED] Another "Failed to load Collabora Online - please try again later" problem - #39 by mobamoba