Agency’s Source Selection Decision Relies on Key Discriminator Not Mentioned Until Best Value Determination; GAO B-414886 et al, AT&T Corporation

Protest challenging the agency’s issuance of a task order award is sustained, where the agency conducted unequal and misleading discussions for the same issue identified in the protester’s and the awardee’s proposals, and where the agency based its source selection decision on a flawed and inadequately documented evaluation.