Universal ssl certificate got renewed after that creating issues for android users

My API domain certificate got renewed on 16th MAY 2023 .Now it is giving issues while some of the android users are using it out Mainly in android version 9 it is saying site is not secure .Please help me out how to mitage it out .My domain that is using is :api.klink.finance

3 posts were merged into an existing topic: Issue with SSL in mobile Chrome