Access denied. You do not have permission to perform this action or access this resource (Nintex for Office 365)

Dear All, 


While I was updating the latest version of  Nintex for Office 365 Forms (version: 2.0.1.1) and Nintex for Office 365 Workflow (version: 1.0.4.3), I created a new Nintex Respoisve Designer and test a workflow with Assign a task along with User Profile Service. 

Assign a Task

My workflow was kept on Terminating.

My Troubleshooting Steps: 

1.  User Permissions and UPS Service
   User and UPS service has proper rights.
2.  Limited-access user permission
   I checked the limited-access user permission lockdown mode feature and it was not activated.
   Site settings  >> Site collection features under Site Collection Administration
    
3. Workflows can use app permission
   Workflows can use app permissions was activated. 
   Site settings >> Manage site features under Site Actions

I went to following links did not resolve my issue 

1. Office 365 Error "Access denied. You do not have permission to perform this action or access this resource.
2. O365 SharePoint Nintex Workflow erroring out today - Access is Denied.

My Solution: 

1. SharePoint Online Site >> Gear icon >> Site Contents >> locate and click on Nintex Workflow for Office 365 >> from Left Menu Select Settings >> Select General >> Under Profile click on Grant access to workflow.
   
   
2. And click on Trust it.
   
   
   

The Nintex workflow started working as usual. 

Aroh

Reference:  Grant permissions to the User Profiles service (Nintex for Office 365)