Edit. I read the date on this post wrong when I did a search. Iām disappointed that there was no response to this year old request for assistance but I will start a new thread now that I see the original post was more than a few weeks old.
I am also having this issue. Nextcloud server and host fully up to date, Android app on latest version on both my phone and tablet. All Office documents now fail to load from the app but load just fine in a browser.
I am running Collabora on a separate host, not using the CODE image in the app store.