Nevermind. I’ve done some more reading where I came across this: Desktop Client reports “Server Version 9.1.4.2 is unsupported!”
That led me here: https://github.com/owncloud/core/wiki/Maintenance-and-Release-Schedule
I guess I need to upgrade to 10. #Sigh…time to upgrade PHP I guess.
I’ll leave the post here but with the page at https://owncloud.org/download/#owncloud-server-tar-ball to clarify that the 9.1.8 version is EOL. The way it is presented there is that one is perfectly ok staying on the 9 branch.