Permesso di soggiorno

I would like to know some issues related to permesso di soggiorno.
I study in MIlan (not mandatory classes ), but live in Lodi.
Recently i applied to renew my permesso di soggiorno in Milan not in Lodi thinking if i study here better to do it here. But unfortunately they postponed one more month demanding the Availability of accommodation in Milan to apply for the residence permit which i still do not have and want to apply in Lodi.
So i would lie to know if someone had similar problems and whether is it possible to have provision of hospitality (comunicazione di ospitalità) in one place (Lodi) but applying in another (MIlan) to get permesso di soggiorno?

Many thanks!


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