I have installed the DEV Dashboard plugin. To activate it I logged in. The page reloads and shows the log in screen again.
The site did get added at: https://premium.wpmudev.org/hub/my-websites/ but I cannot acces the dashboard to install other plugins.
I thought it might have been a hiccup on your server's end, but a few days later it still persists.
I've reinstalled the plugin but nothing changes, the error log is not showing anything.
Do you have any idea what is causing this behaviour?
I have just installed the plugin on an other website. This worked as normal.
But now I notice the site I added in the first place is gone from https://premium.wpmudev.org/hub/my-websites/