where you can ask about model problems
The COSMO consortium has a dedicated team to answer technical questions related to the ICON model. This service is open to public.
The consortium member states, run daily the ICON-model for their regional needs, so they are experts in ICON short-range/local-area forecast mode and related processes (like assimilation, ensemble, nowcasting, specialized post-processing etc).
▶ to get help, mail your question at icon-supportcosmo-model.org