Firstly, we will see what is the use of document ID.

Document IDs help you manage your documents by providing an easy way to track items regardless of their location.

You must be a site collection administrator to activate the DOC ID Feature in a site collection.

Open SharePoint team site.

Open SharePoint team site

Navigate through site settings.

site settings

Under site collection administration, click site collection features.

Click site collection features

Find Document ID Service then Click Activate.

Find Document ID

Now the Document ID Service has been activated successfully.

Document ID Service

Under site settings, click site collection administration.

Click Document ID Settings.

Click Document ID Settings
Check Assign Document ID’s.

Provide the “Begin IDs with the following characters”.

Begin IDs with the following characters

Click OK to complete.

Now Create a document library to check how it works.

Create a document library

Upload one document into this repository.

Upload one document

After complete document upload click on view properties of the document to see the Document ID has been included successfully.