Any incidents should be reported using the procedure described in the following link:
How do I report an incident?
Furthermore, in general and provided they involve functional (not technical) problems, you can send your queries to :cicep@igae.hacienda.gob.es.
For the subsystem for the General State Account consolidation, you can consult the functional concerns (non technical) at:
GContabilidad.CGE@igae.hacienda.gob.es
For suggestions, incidents or requests for purely technical support, you can send an email to:
contapri@igae.hacienda.gob.es.