I tried to change a condition in existing workflow and while saving it I got an error “Error You have not been allowed as a workflow designer on this teamsite. Contact your Administrator for access.”
What would this mean?
I believe you need Designer permissions in SharePoint in order to modify a workflow. If I were you, I'd grant myself permissions as a Designer to that site just to see what happens. Yes, I know you said you are owner at the parent level but this is just for troubleshooting.
Sounds like permissions error, check under site settings > Nintex Workflow > Allowed workflow designers
I have Contribute, Restricted Read and Owners permissions respectively with three groups that I belong to.
Besides the SharePoint group permissions, can you verify your permissions that Mike suggested? site settings > Nintex Workflow > Allowed workflow designers
Can you try to add yourself as a user under the Allowed workflow designers to see if that works?
Do you edit the worklfow in unique permission site / list?
The permissions to Allowed workflow designers are inherited from the Parent Site in which I am already a owner.
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