We have come across the question does AuthAnvil SSO work in conjunction with ARR (Application Request Routing Service).
We officially support High Availability and Redundancy through Microsoft's Network Load Balancing (NLB) mode for web team farming.
We also support when deployed using Azure IAAS the Azure Load Balancer instead of NLB.
We have not tested nor support the use of ARR for AuthAnvil SSO due to performance caching mode already built into our product.
Due to this reason enabling ARR while using AuthAnvil SSO will cause issues on Authentications.