Screen reader is not announcing the options information of combo edit fields available under dropdown

[msftedad]

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Steps to reproduce:

1. Launch URL: Dropdown header | Selectize on Chrome browser.
2. Home page appears.
3. Navigate to selectize plugin demos on left and expand
4. Navigate to dropdown header and press enter
5. Turn on screen reader and navigate through dropdown option

Expected result:
Screen reader should announce the options information of combo edit fields.
EX: Screen readers should announce the focused combo list item/ option information like 'awesome 1 of 5" while navigating on the options.

Actual result:
Screen reader is not announcing the options information of combo edit fields (like 'awesome', 'beast', 'compatible' 'nikola'.., available under 'Create allocation' dialog.
Observation:
Screen Readers (Narrator) remain silent while navigating on the options/ combo box list items, NVDA announce as blank

[you can add explanations here of the context/what you were trying to
do, and if you have findings about what the cause might be]