A system issue occurred in facebook account kit

If you try to Login With Account Kit and Try to Generate:-

1- the AccessToken Code you must Enable the Client Access Token Flow and set new AccountKitConfiguration.AccountKitConfigurationBuilder(LoginType.PHONE, AccountKitActivity.ResponseType.TOKEN);

2- the Authorization Code you must Disable the Client Access Token Flow and and set new AccountKitConfiguration.AccountKitConfigurationBuilder(LoginType.PHONE, AccountKitActivity.ResponseType.CODE);

Please check the Client Token it is exactly the same as on dashboard!!
Also check the manifest file do you properly add the Account kit activity and meta data of Account kit.

If again having problem feel free to ask.. Thanks.

Don't forget to change ACCOUNT_KIT_CLIENT_TOKEN from string.xml

ACCOUNT_KIT_CLIENT_TOKEN using the client token found in the Account Kit tab in the App Dashboard.

https://developers.facebook.com/apps/FB_APP_ID/account-kit/settings/

In above url replace FB_APP_ID to your application id

Please check your internet, when you are clicking on next, if the internet is not there, then you will face this error apart from client access token not being given

Go To Products Tab--> Setting --> Server Side Validation is Enabled

1). Allow Email Login Yes

2). Allow Phone Number Login Yes

3). Enable Client Access Token Flow Yes

4). Require App Secret No

just because u might not be removed [] those brackets... i did the same thing. then i had found this syntax error

this is wrong--> <string name="ACCOUNT_KIT_CLIENT_TOKEN">[AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA]</string>

this is right-->(no BRACKETS)

<string name="ACCOUNT_KIT_CLIENT_TOKEN">AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA</string>