Subaccounts are Pirsonal accounts created by a Master Account. Subaccounts do not differ from normal accounts in the way users can log in.
Therefore, access to a sub-meeting is done from https://app.pirsonal.com/login if the sub-account runs in a standard environment. If the sub-account was created in a private environment (Enterprise), you must contact the MASTER account so that you provide the access URL to the logo page.
Subaccounts users need to login into a Pirsonal account with a User Email and Password. Subaccount users can also restore a password.
Subaccount users also have private API credentials (Account ID, Account Secret).