Unable to add a vcenter server instance on embedded vRO from vRA

Hello,

I'm trying add a vcenter server instance on embeded vRO from vRA but the following error is returned:

Same thing happens when trying from vRO client:

BUT, two days ago (see green workflows) I was able to add the same vCenter using the same workflow configuration, including user credentials and was not changed.

Anyone have any tips of how to solve this problem ?