Maillings not loading after upgrade to 8.5 R05

Hi, I recently upgrade a customer from 8.2 R04 to 8.5 R05 and after upgrading user cannot not edit any maillings.
Everything else works seemingly fine, but when opening any mailing and pressing edit it's starts to load and never stops.

I've tried checking the log, but cannot see anything related.
I have added symmetrickey and secret to web config.
They are running the service netserver in default web site and web/service on a seperate site.
They do not use Service.

Any tips on what to do?

RE: Maillings not loading after upgrade to 8.5 R05

Mailings is technically considered to be Service

By that: CRM Web and Service must be installed on the same root domain

 

Also: https://community.superoffice.com/en/technical/Forum/rooms/topic/superoffice-product-group/customer-service/new-values-for-service-configuration-from-84-r04/

Av: Erik Eide 27. sep 2019