When I try to create a spatial map series in an existing project, the option for a spatial map series in inactive/grayed out, both in the drop down menu and in the full dialogue box. I tested it in different layouts with different maps within the same project, and got the same result.
When I create a new project and just add the data I was going to use in the map series, the option is available. Is there something I should be looking for in my existing layers that complete knocks out map series?
The only time spatial map series should be disabled is when the layout doesn't have a map frame, or that map frame doesn't have a layer that can be used for a map series. Bookmark map series should be disabled if the layout doesn't have a map frame, or the map frame doesn't have any bookmarks. If you are seeing these options disabled at other times there may be a bug in the software. I recommend reaching out to technical support who can log a bug.