Hi Jeppe,
thank you for reaching out.
With the release of our new version earlier this year, we disabled the multisite synchronization as we are redesigning this piece. (Our previous version was embedded in the WooCommerce pages, but that gave all sorts of problems, so earlier this year we decided to move out of WP and create a web based solution instead.)
The store sync is currently in development and will be a standard feature by the end of this year (we have it planned for release shortly)
The way this will work is you will be able to select the different location from the top filter on the page ‘Store’ and either select all, or individual stores. At a later stage, we will also release a multi-warehousing feature, but that is planned beginning next year.
We will make sure to update the documentation on WordPress – last thing we want is to mislead people ??