A candidate who fails the examination or whose eligibility has expired must reauthorize to test again. Candidates may reauthorize online at cdrnet.org/reauth, by email (firstname.lastname@example.org), or by telephone (312-899-4859). Email requests should include the candidate’s name and CDR candidate ID. Reauthorization does not occur automatically. Candidates will be allowed to retest 46 days after taking the examination unsuccessfully.