I am working with a customer and we would like to make use of the capabilities within the Dynamics 365 Portal, but have a few questions regarding its scalability. This customer has a requirement for short-term peak workloads on a yearly basis where 100,000’s of people will need to re-register with the service. Whilst I understand that the portal is Azure PaaS based, I understand that there is no access to the instance size/scalability settings that you would usually get within an Azure WebApp PaaS instance.
Can someone please explain how/if the Dynamics 365 portal can scale for large workloads, and if it would be suitable for this type of role?