Lead Conversion in Salesforce is usually done one at a time in conventional method. Multiple Lead Converter is a native app that converts multiple number of Leads at a time providing additional features.
We show Salesforce accounts that are linked to Trailblazer.me and have the Manage Billing permission. If your account is missing, check that you connected the account to your Trailblazer.me profile. Then verify that you’ve been assigned the Manage Billing permission in the related org.