I can't seem to find Request Approval action in Nintex Workflow for Office 365 Trial version. Has this action been deprecated in the cloud version or because of trial it's not available?
Currently Nintex Workflow for Office 365 (Trial Use) has only Assign a Task which can help in approval.
I'm not sure if anyone having another approach for such an approval workflow.
Here is approval action comparison (old but perhaps still valid to all of newest Nintex) Nintex Approval Action Comparision
It is not available on the Office 365 version. Instead you can use the Start a task process action
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