In the Sentinel 7.3 User guide section 10.1 it states:

Reports and Correlation rules provide an integrated view of a user's
true identity, even across multiple systems on which the user has
separate accounts. For example, accounts like COMPANY\testuser; >
cn=testuser,ou=engineering,o=company, and can be
mapped to the actual person who owns the accounts.

What needs to be done to link test accounts with the users normal account?

We have admin accounts and sentinel somehow linked those accounts to our
normal ID's in QA. I think it maybe due to the id being the same except
for a suffix on the account.