“No submissions through Grants.gov will be accepted. All submissions must follow SAM.gov instructions. For full opportunity announcement reference the SAM.gov link”
Additional eligibility information: For full opportunity announcement reference the following hyperlink from SAM.GOV below. https://sam.gov/opp/b2d1464c626f49db991a9e44f6976f4a/view
Each funder sets its own eligibility, so check the details on their page before you apply.