If you have an eRA Commons (NIH) account, and it's not linked to your NCBI account, link your eRA Commons login to My NCBI.
Note: You do NOT have to have an eRA Commons account to create a My NCBI account, or to create a My Bibliography, but you do need to have an eRA Commons account to view any grant information within your My Bibliography and to make grant + publication associations.
Note: You can link other accounts to My NCBI, too. We recommend that you link your ORCiD account as well, so you can access your ORCiD profile when you create an NIH biosketch using SciENcv. If you are not NIH funded, you can still login via Google, ORCID and many other options.