Failed to connect to 2a03:2880:2130:7f07:face:b00c:0:1: Network is unreachable

https://testapp1.co.nf/?fb_publish_validate=1&cauth_return=Facebook

Array
(
[cauth] => Array
(
[Facebook] => Array
(
[id] => Facebook:1462936256
[start_url] => https://testapp1.co.nf/?fb_publish_validate=1&cauth_return=Facebook
[config] => Array
(
[enabled] => true
[id] => *********
[secret] => ***********
)

)

)

[FBRLH_state] => 2ed8f446d7023bde47a7ad79f85435a2
)

Failed to connect to 2a03:2880:2130:7f07:face:b00c:0:1: Network is unreachable

I checked creating different ID and Secret Where is problem can you please describe ..

https://www.ads-software.com/plugins/facebook-publish/