ITC Availing??

A business with a GST number in Daman has hired office space in Chennai for marketing. The Chennai office is issuing invoices charging CGST and SGST, which raises concerns about the eligibility for Input Tax Credit (ITC). The core issue is that without GST registration in Chennai, these invoices may be invalid, and IGST should likely be charged for inter-state transactions. Advice is sought on how to correctly avail ITC in this situation.