When launching workflows, I get the error "invalid credentials" when trying to browse a vcenter for choosing objects. This happens in Orchestrator client (vROWorkflowDesigner), or through the vcenter web view in the orchestrator panel. 
The vCenter is connected to an AD, and I have no login issue there, orchestrator is configured to use SSO through the vCenter, and that works fine either; I have no errors when logging in to the vCenter or to the designer. I have found messages about restarting the SSO, which I did several times with no improvement.
I have several users from the same AD group, that group provides user authentication and authorization for everything. But I get different behaviour among users, some have the "invalid credentials", some not. Sometimes the "invalid credentials" goes away (as it did a few minutes ago, I had the error on the web view, I login to the client, no more issue there, tried again on the web view and it worked... but I don't know how long this will last).
Has anyone already had that kind of behaviour and solved it ? Thanks !