I downloaded DemoAccessControlPlugin. After successfully building placed the dll to Milestone\MIPPlugins folder. When trying to create a new Access Control on Management Client 2021 R1 getting exception “Unable to receive configuration from the access control system. …”
Have you remembered to start the demo application coming with the sample as described in the documentation: https://doc.developer.milestonesys.com/html/index.html?base=samples/pluginsamples/demoaccesscontrolplugin/readme.html&tree=tree_1.html
Thanks Peter