The General Services Administration (GSA), Federal Acquisition Service (FAS), Technology Transformation Services (TTS), Technology Acquisition Division intends to add National Institute of Standards and Technology (NIST) Special Publication (SP) 800-63 Revision 4 assessment services via an out-of-scope modification to Contract No. 47QPCA24P0001 with Kantara Initiative, Inc. in support of Login.gov's Rev. 4 certification. Login.gov is a shared authentication platform providing the public secure access to participating Government services. It participates in the Kantara Identity Assurance Program and holds the Kantara Trust Mark certification to demonstrate conformance with federal digital identity standards. To obtain the Rev. 4 Kantara Trust Mark, the Rev. 4 assessment services are required. The Rev. 4 assessment services do not fall within the scope of the original contract and are being added on a sole-source basis. Basis: The required assessment services are available from only one responsible source. Under Kantara's recently restructured Identity Assurance Program, entities seeking Kantara certification must obtain the required assessment services directly through Kantara. As a result, Kantara is the only responsible source through which the required Rev. 4 assessment can be obtained. Notice of Intent: This notice is provided in accordance with RFO-FAR 5.101 and RFO-FAR 5.201. This is not a request for competitive quotes or proposals. The Government intends to award the out-of-scope Rev. 4 assessment services on a sole-source basis to Kantara Initiative, Inc. under the authority of RFO-FAR 6.103-1, Only One Responsible Source. Interested parties may submit a capability statement demonstrating the ability to provide the required assessment services, which will be considered by the Government. A determination by the Government not to compete this requirement based upon responses to this notice is solely within the discretion of the Government. Information received will normally be considered solely for the purpose of determining whether to conduct a competitive procurement. Response Deadline: Responses are due no later than 10:00 am PT on 07/18/2026. Point of Contact: Jonah Jordan, Contracting Officer, jonah.jordan@gsa.gov