Updates dont work through the HUB

Hi,

i have several websites that i use and have connected them through wpmudev. When i am trying to update the plugins through there, i get always an error message. " We did not get a response from your site yet. The update might still be in progress, visit your dashboard to confirm.
You can always simply update via your dashboard." Before it was a different one talking about,some permissions.

Can you please advise why?