What is eRA Commons?
The Electronic Research Administration or eRA Commons is an online interface where signing officials, principal investigators, trainees and post-docs at institutions/organizations can access and share administrative information relating to research grants.
Do I need an eRA Commons account?
Signing officials and Principal Investigators (PIs) from applicant organizations do need an eRA Commons account, as do other people who may be assisting in the process of grant application submission.
Multiple NCBI Accounts
If you suspect that you have multiple My NCBI accounts, write to the NCBI help desk at info@ncbi.nlm.nih.gov and include the following in your message:
If multiple My NCBI accounts do exist, the help desk can assist in merging them into a single account. All existing linked accounts will transfer to the single account. The single account will contain all contents of the accounts including saved searches, collections, bibliography entries, etc.
You may log into the National Instutites of Health Manuscript Submission (NIHMS) system and submit a manuscript under one of the following account types:
More information about these account types can be found at the NIHMS website.
If you do not have any of these account types, you may register for an My NCBI account here.
If you already have a My NCBI account, you may link your eRA Commons account to your My NCBI account. This will allow you to monitor the NIH Compliance status of your NIH granted funded publications through your "My Bibliography."
To link your National Center for Biotechnology Information (My NCBI) account to an National Institutes of Health eRA Commons or other account, sign in to your NCBI account and click on your username that displays at the top right of the browser page. This will take you to your account settings page. The "Linked Account" section will display a list of accounts currently linked to your NCBI account. To add a new linked account, search the "available partner accounts" for eRA Commons.
Choose the account type you wish to link from the "Login Account Options" table and enter your credentials on the sign in page for that resource. To verify that linking is complete, by accessing your account setting page again or looking for the eRA linked logo under your My NCBI account Biblography.

Further NCBI login and account help can be found here. Contact NCBI if you receive an error message when trying to link your accounts. info@ncbi.nlm.nih.gov