EXHIBIT 31.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

I, Patrick J. O'Malley, III, certify that:

1.I have reviewed this Annual Report on Form 10-K/A of Avaya Holdings Corp.; and

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.

Date: January 25, 2019

/s/    PATRICK J. O'MALLEY, III

Patrick J. O'Malley, III

Senior Vice President and Chief Financial Officer

(Principal Financial Officer)