Marking a vendor as awarded does not automatically notify all other vendors.
To notify respondents, you can publish a Public Award Notice or send out a Public Notice or email to all respondents notifying them of the award. (Do note that in order to do this, we would have to enable the Public Award Notice and Public Archives features for your portal which requires the permission of your organization administrator.)
You can also just notify the respondents externally (e.g., by email).
Please note that this differs from who is notified of a Public Notice.