Hy guys I hope that you are all well.
I stumbled on this thread Step by Step Multi DB Installation guide
Mindful of Andrew's answer half way down the post (which I quote)
Yep. You need to add all global tables for installed plugins to db-config.php prior to enabling Multi-DB. When installing new plugins be sure to add the global tables to db-config.php prior to adding in the plugin files.
...I have a question:
As part of the Premium subscription with WPMUDEV, what are the plugins that need a global database?
Thank you for your support.