The phrase "assigned accounts" refers to specific customers or clients that have been given to a particular person or team to manage and take care of. Full definition
Work with sales, customer service and clients for initial set - up, website refresh and any additional transactional projects for assigned account base. (jobhero.com)
The large houses will also assign an account manager to them that they can meet with to help plan their investments. (money.stackexchange.com)
To plan and carry out all sales activities on assigned accounts or areas. (best-job-interview.com)