Migrating a package to Umbraco 16 - Index problem with ContentValueSetValidator

Questions
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8

Do you have any code samples of the usage and arguments of ConfigureForumIndexOptions?

IScopeProvider in your case should come from Umbraco.Cms.Infrastructure.Scoping since ContentValueSetValidator uses this one.
If I check the ContentValueSetValidator (from Umbraco.Cms.Infrastructure.Examine), it shows that it uses the one from Cms.Infrastructure:

This code snippet showcases the definition of a public interface named "IScopeProvider" within the "Umbraco.Cms.Infrastructure.Scoping" namespace, inheriting from "ICoreScopeProvider" and providing scopes as described in the summary. (Captioned by AI)
This code snippet showcases the definition of a public interface named "IScopeProvider" within the "Umbraco.Cms.Infrastructure.Scoping" namespace, inheriting from "ICoreScopeProvider" and providing scopes as described in the summary. (Captioned by AI)605×195 6.32 KB

It also tells me the Cms.Core is obsolete:

image
image1063×111 7.71 KB

Make sure you have the following ‘using’ in your file:

using Umbraco.Cms.Infrastructure.Scoping;

Please also make sure your NuGets are also up to date (both installed and transative) and are running on 16.
Edit: the ContentValueSetValidator that you mention is the one from Umbraco themselves right, not a custom one with the same name?