Today I tried to create an item in calendars using Nintex on Office 365. I configured a service account and an user account to impersonate. But my 
workflow kept giving me:
The request cannot be processed due to internal error.
I found an article by Danny Ong. However Danny is using the admin@tenant.onmicrosoft.com account. Where I’m using my service service@tenant.onmicrosoft.com and I’m impersonating pieter.veenstra@mydomain.co.uk.
Once I changed my service account to service@mydomain.co.uk the problem went away.
My service@mydomain.co.uk has a calendar within our domain where service@tenant.onmicrosoft.com doesn’t have a calendar. This seems to be needed.
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Pieter Veenstra
Is your business still running on paper trails, sprawling Excel files, or ageing Access databases? There's a better way — and I can show you exactly what it looks like. I'm the Technical Director of Vantage 365, a Microsoft solutions consultancy working with clients across the UK, the Netherlands, and worldwide. For over 30 years I've been turning messy, manual business processes into clean, automated systems that save time, reduce errors, and give teams the visibility they need to make better decisions. You can contact me using contact@sharepains.com