I kept getting this error when I started a new custom report for a client.
Turns out the connection string "disco.crm4.dynamics.com;<organizationname>" was my problem.
After some trial and error I created a custom report by using the wizard in crm and downloaded that report. The connectionstring contains the organization UNIQUE NAME instead of the organization name.
For those who do not know where to find the organization unique name:
CRM > Settings > Customizations > Developer Resources
Is this always the case in CRM 2016? For another client still on CRM 2015, the organization name in the connectionstring still works.
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