external supplier registration requests getting rejected

Summary:

external supplier registration requests getting rejected

Content (required):

hi team - i have setup two stage approvals for external supplier registration as below.(for BU lets say UN GTQ BU)

stage 1 - serial approval - Inviting procurement BU = UN GTQ BU && Source = External -- Action : Approval Required: Worker: user1

stage2 - serial approval - Inviting procurement BU = UN GTQ BU && Source = External -- Action : Approval Required: Worker: user2

with the above approval setup, when im trying to register a supplier through external URL, request is getting auto rejected. if some one can please help where im going wrong.

attached the doc with screenshots.