We appreciate your feedback. We are in the process of updating our Multi-select component to align more closely with WCAG standards in 25.1. Currently, the user can navigate to selected items in the combobox using the arrow keys. Therefore, in the interim you could try adding instructions with an info icon that includes “Use right/left arrow keys to navigate to selected items”.
Best regards,
Jill Power | Senior Manager, Shared User Services Engineering, Accessibility