This issue comes up fairly frequently and almost all of the courts which have considered it have answered it the exact same way. An owner of a unit of a condominium does not have standing to sue the attorney for the condominium association.
The lawyer for the association is responsible to the association’s board of directors, not the unit owners. Allowing random unit owners to sue the lawyer for the association would place the lawyer in a situation where he would have to serve numerous “clients” all of whom have conflicting interests.