iPhone Warranty in Kenya

Dear Sir/Madam,

I purchased the Iphone11 from USA Atlanta in January 2020. Presently I am in Nairobi, Kenya, and using the iPhone here. My iPhone is having an issue with Silent Button. It's not functioning for the last few months. I want to claim a warranty on this item. However, I tried enquiring for warranty claims at your service providers in Kenya but they mentioned that the International warranty is not valid on this device of Iphone with serial number- DN******72J. My warranty expired just yesterday on 17th Jan 2021. Please help me as I was assured during purchase that the device has international warranty in Kenya. Please help me to claim the warranty or replace the device .

Thanks & regards.

Akash

[Personal Information Edited by Moderator]