Issue in opening Action Center, not able to access

Hi @niketan.rana

Can you please check on orchestrator what role you have assigned.

Then go to manage access-> roles, find that role and check in permissions allowed under that role for you.
That should have 3 rows for action center related permissions as shown below. Please assign yourself permission to view/edit/create from there. You will need to specifically assign action assignment view to you to be able to see this landing page.

Regards
Sonali