🇺🇸United States @ctgraham

Confirmed the problem, and confirmed that the proposed fix in bc4176cf resolves it.

We are also interested in support for "is all of".

Class Drupal\domain_access\Plugin\views\filter\DomainAccessFilter could readily extend Drupal\views\Plugin\views\filter\ManyToOne rather than Drupal\views\Plugin\views\filter\InOperator, but existing filters would have settings where the operator value is "in" and "not in", rather than "or" and "not", respectively. The change will need to migrate the existing operator values, or will need to support legacy values.