3624587 - I'm not receiving the activation email

I do not receive the activation email when attempting to create a new sub-user from an existing account. Instead, I see a message instructing me to contact my account administrator. 

existing account, sub-user, email delivery issue, registration problem, user activation error, supplier registration help  , KBA , BNS-ARI-SLP-REG , Supplier Lifecycle & Performance Registration , BNS-ARI-SLP , Supplier Lifecycle & Performance , BNS-ARI-SS-ADU-NOT , Strategic Sourcing User Administration Notifications , BNS-ARI-SS-ADU-LGI , Sourcing Login Issues , BNS-ARI-SLP-REG-NOT , Email Notifications , SBN-AN-TPO , Registration & Onboarding , BNS-ARI-SS-ADU , User Administration , BNS-ARI-SIPM-REG , SIPM Registration/Login , BNS-ARI-SIPM , Supplier Information & Performance Management , SBN-AN-ADM , Administration (Buyer & Supplier Account Administration) , Problem