Learning Assignment- No Learners shown when searching. How to fix it?

Summary:

Hi Everyone!

In Learning Assignment we're trying to add a learner however, no learner was shown although it is new or old employee. Tried the Solution below from the Document 2376525.1 (oracle.com). Unfortunately, still no results occurred.

Looking forward to everyone insights :) Thank you!

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

23D

Code Snippet (add any code snippets that support your topic, if applicable):

Document 2376525.1 (oracle.com)