Whether Registration Required in Another State - Goods and Services Tax - GST

Madams/Sirs, My client is a company engaged in business of providing translation services having principal place of business in Punjab. They have employees from all over the country. Their 95% of turnover is from export of services. Their aggregate turnover exceeds Rs. 10 Crores. They are registered in Punjab under PGST Act, 2017 . Now they have taken on rent a small building in Maharashtra (Pune). This building is used exclusively as office (back office) where employees in Pune provide translation services to the company for its ongoing projects. It can also function as a hub where outside contractors come into the back office and provide translation services to the company. No service is provided to any customer from Pune Office directly i.e. there is no sales/turnover from Pune office. The Pune office employees report to Punjab office and all the work gets invoiced from Punjab Office. My query is whether they would be required to obtain GST Registration in Maharashtra because we are already registered in Punjab and have a fixed establishment in another state i.e Maharashtra.