Yes exactly. If it does not display the ID anywhere in ActiveCampaign you can use n8n to find it. Set Resource to “Tag” and “Operation” to “Get All”. It should then return all that exist with their IDs.
We are following here the API. ActiveCampaign allows to add one Tag at a time and Automizy multiple ones. We could abstract that away and do multiple calls underneath the hood. That would however be a breaking change and will for that reason not be made right now.