SharePoint Managed Property Online Search Issue – Custom User Profile Property

I’m facing an issue with SharePoint Online search and could use some help.

I created a custom User Profile Property (Text) in SharePoint and mapped it to a Managed Property for search. However, when I query the managed property, the value is always returned as null.

What I’ve tried so far:

- Reindexed the User Profiles using a PowerShell script.

- Updated the user profile property values multiple times.

- Waited for search/indexing to complete.

- Verified that existing/default user profile properties are appearing in search results correctly.

Interestingly, existing user profile properties work as expected in search. The issue only occurs with the newly created and mapped property.

Has anyone faced a similar issue with a newly mapped User Profile Property → Managed Property? Is there any additional step required to make a newly created user profile property searchable?

Any suggestions on what else I can check would be appreciated.