Sometimes a record cannot be retrieved by its Entity URI in the user interface, but the same record can be fetched through POSTMAN using Entity URI.
Step 1 – Login to the tenant and check the Entity. If not it is not visible, proceed to step 2.
Step 2 - Try retrieving the entity using POSTMAN
Step 3 - Check the response carefully to see whether the entity is "soft deleted."
If the response contains the endDate parameter and that date is set to the past, then the entity is soft deleted and will not be visible in the UI (when searched using URI). However, a direct link to the entity works.
The link below provides details of Retrieving or Modifying the Entity startDate and endDate.
End-dated (soft deleted) entities are not visible in the UI.