My application sometime get 401 error on login via API

REST API
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#1

Hi,
I’m currently developing a application on both iOS and Android, I holding back-end possition.
My kakaotalk login workflow is mobile will get accessToken then send it to back-end, then i will send it to https://kapi.kakao.com/v2/user/me as the document told me so.
It’s working sometime but mostly fail and response as 401 and Unauthorized message.
I really need some help cuz this is my first job
Thanks you

#2

Hi~

Tell me your app ID.
(My Application>App Settings>Summary > ID)