Residence question

Hello everyone,

I’m a Lux citizen, obtained my nationality in July 2024. Before I was a resident, but from August I moved to Italy, (temporary, for private reasons) not declaring anything. Also from August in the house I’ve been residing there is a new tenant, with whom I have no contact with. So literally I didn’t move out from that house and I have no idea if the new tenant signed me out. (Is that possible without my permission?).

So the question is - now I want to move to Italy officially and make a residence here. But the thing is - I have no idea if I’m still a resident in my commune in Lux. if, in case I’m not a resident anymore, there is any consequences for those, who are lux citizens but having no residence for already 8 months? How do I present myself in the commune to declare that I’m going abroad ?

Thank you.