Re-create account

This is an inquiry regarding a personal account holder (Personal Information redacted) who wanted to use our BOX account, which we contacted the other day.
This is a duplicate of the previous inquiry, but
"Unable to add one user"
"Group and folder selection and user settings for existing Box users are
It will be available once the user accepts the invitation."
There was a message saying.
After receiving the reply from the other day, I am resetting my password.
A message appears saying you have been invited to join an Enterprise account.
I think I can use it by accepting the invitation I received, but I am not included in the managed users of our BOX. Is this possible to use BOX? Please let me know what kind of processing is required to include it as a managed user.