A couple of sites got disconnected overnight, so I tried to reconnect them in bulk on the Sites page. I selected them and chose the Reconnect option in the bulk actions and hit Apply. The page says to process it and reloads the page, but the sites don’t get reconnected.
It was possible to reconnect them on that same screen 1 by one by clicking the red cross. Hopefully the bulk option can be fixed as well.
I’m running the latest 5.4.0.2 versions (prerelease with fixes) of both dashboard and child plugins.
After reloading the page, the sites were shown as connected and sync worked properly for them.
I’ve also tried it on the pre-release versions (Gravity Forms fix for the Dashboard, and Git Updater fix for Child plugins), and I also tried it with latest official releases.
Can you check if anything relevant was logged in CEM (/wp-admin/admin.php?page=ActionLogs), if you have it enabled?
Can you reproduce this behavior on your Dashboard?
I just had another site that disconnected and it’s not possible to reconnect it using the bulk function. So I enabled the Debug function in CEM, and tried again. Nothing is logged however.