I am using Office 365 update item permissions action. I want to set custom permission level which I created. Custom permission is not listing in permission dropdown in this action. Do you have any solutions to fix this issue?
I have the same problem, but unfortunatly Nintex O365 doesn't get currently SharePoint permissions but reproduce the behavior.
For the moment only permissions on Nintex are available.
If you create new permissions in SharePoint they are not visible in Nintex and if you modify the behavior of native permissions they don't affect the Nintex permissions visible.
I'm going to a Nintex Partner round table next month, and this request was one of my requests.
You can vote for that change on the Nintex User Voice page:Add custom permission levels for "Office 365 update item permissions" action – Customer Feedback for Nintex
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