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Our CRM instance got update an update this weekend (version 1710 (9.1.0.10334), gcc region) and since than we can't register new plug-in assemblies or update existing.
Error is:
ERROR: Exception retrieving custom activity info using SandboxWCFMethod - Unhandled exception: Exception type: Microsoft.Crm.CrmNotSupportedException Message: This action is not supported. at Microsoft.Crm.Sandbox.SandboxCustomActivity.GetSandboxCustomActivityInfo(ActivityInfo activityInfo, Guid organizationId)
It looks really similar to this issue: https://community.dynamics.com/crm/f/microsoft-dynamics-crm-forum/253106/registering-a-custom-workflow-activity-using-plug-in-registration-tool
So I guess it comes from SDK version mismatch.
But which SDK assemblies versions am I supposed to use with this CRM version?
Latest I see in NuGet is 9.0.2.21 with comment "Updating for 9.1.0.10129" which doesn't work for us.
It's strange but it started working after I downgraded .Net Framework version from 4.7.1 to 4.6.2
I had the same issue this morning while i was trying to update the existing custom workflow activity with the same nuget library (Microsoft.CrmSdk.CoreAssemblies)package. I discovered that dynamics instance version was changed over the earlier night. To resolve the issue i had to update my project's .net framework to 4.6.2 and update the nuget package for the latest stable version. Then after building the project i was able to register and update the custom workflow activity.
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