Scale synchronization still works fine from Power BI Desktop. Once published on Power BI Service, same chart displays columns on a secondary scale even if the option is not activate. Issue is obser...
We are seeing this issue on our tenant as well - fine in Desktop.
I came across this old post - https://community.powerbi.com/t5/Issues/Shared-Y-Axis-no-longer-functioning-for-a-Line-and-Column-Chart/idi-p/1093579
Removing my zeroed axis (same as mentioned in comment) worked for us as well however this is a major concern as we are often encouraging our authors to zero their axis.
Definitely want to hear more about whether there is a plan in place to fix this bug.