India asked Pfizer to conduct more "bridging trials" that included Indian subjects too instead of just American and British ones and Pfizer refused. So they rejected the vaccine and Pfizer withdrew its application for Emergency Use Authorisation in India.
Source Material: ⁣https://theprint.in/health/why-indias-expert-panel-rejected-emergency-use-nod-for-pfizer-vaccine/599529/

Video Credit: ⁣https://www.thelastamericanvagabond.com/

and Times Now India