If by any chance your system contains duplicate accounts - or e.g.: two customer companies merge; you can merge two or more accounts into one by going to Member > Accounts and selecting the accounts you want to merge.
Click the Merge Accounts button at the top of the list.
Select the Master account - the one that will be kept as an activa account in the system - then save your changes by clicking OK.
Note - Payment details and set-ups (such as auto-pay) will not be brought across from the original accounts. Your tenant will need to enter these again via portal after the accounts have been merged.