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Here is another unanswered question from the 8.7 thread:

While on the subject, the public UserAccessor#isDeactivated method was deprecated late in the 7.x series, with a suggested replacement of DisabledUserManager#isDisabled. But the DisabledUserManager bean does not seem to be accessible to plugins.

Trying to import the interface directly does not work, and neither does trying to do a named import of disabledUserChecker (which is what the actual bean seems to be named). Trying to import the underlying class CrowdDisabledUserManager also fails.

Am I doing something wrong, or is it possible that something needs to be addressed on the platform side?