My Account - Ability To Use Username/Email Taken by Expired or Canceled Accounts

Just learned that my work email is no longer accessible for use on this platform due to the fact that it was listed as the username on a previous account which was cancelled. My team uses this platform frequently for a variety of clients and as such accounts are opened and closed frequently. The inability to free up my email address  is very inconvenient. This could create a load of issues for our team and may cause us to utilize a different platform in the future.