Request token retrieval failed:

RESPONSE:

Array
(
    [linkedin] => Array
        (
        )

    [info] => Array
        (
            [url] => https://api.linkedin.com/uas/oauth/requestToken
            [content_type] => 
            [http_code] => 0
            [header_size] => 0
            [request_size] => 0
            [filetime] => -1
            [ssl_verify_result] => 0
            [redirect_count] => 0
            [total_time] => 0.11195
            [namelookup_time] => 0.01609
            [connect_time] => 0.111998
            [pretransfer_time] => 0
            [size_upload] => 0
            [size_download] => 0
            [speed_download] => 0
            [speed_upload] => 0
            [download_content_length] => -1
            [upload_content_length] => -1
            [starttransfer_time] => 0
            [redirect_time] => 0
            [certinfo] => Array
                (
                )

            [redirect_url] => 
        )

    [oauth] => Array
        (
            [header] => Authorization: OAuth realm="http%3A%2F%2Fapi.linkedin.com",oauth_version="1.0",oauth_nonce="18b1451781dd267e3f295a9da060aad8",oauth_timestamp="1597509957",oauth_consumer_key="02ga5sjqn6es",oauth_callback="http%3A%2F%2Fm.biodiscover.com%2Findex.php%3Fr%3Doauth%2Flinkin%26url%3DaHR0cDovL20uYmlvZGlzY292ZXIuY29tL25ld3MvYWN0aXZpdHkvNzM1NTYxLmh0bWw%3D%26lType%3Dinitiate%26lResponse%3D1",oauth_signature_method="HMAC-SHA1",oauth_signature="UJWDCF5JFWq%2BPoC1LwBXotAYFqs%3D"
            [string] => POST&https%3A%2F%2Fapi.linkedin.com%2Fuas%2Foauth%2FrequestToken&oauth_callback%3Dhttp%253A%252F%252Fm.biodiscover.com%252Findex.php%253Fr%253Doauth%252Flinkin%2526url%253DaHR0cDovL20uYmlvZGlzY292ZXIuY29tL25ld3MvYWN0aXZpdHkvNzM1NTYxLmh0bWw%253D%2526lType%253Dinitiate%2526lResponse%253D1%26oauth_consumer_key%3D02ga5sjqn6es%26oauth_nonce%3D18b1451781dd267e3f295a9da060aad8%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1597509957%26oauth_version%3D1.0
        )

    [error] => OAuth callback URL was not confirmed by the LinkedIn end-point
    [success] => 
)


LINKEDIN OBJ:

LinkedIn Object
(
    [callback:protected] => http://m.biodiscover.com/index.php?r=oauth/linkin&url=aHR0cDovL20uYmlvZGlzY292ZXIuY29tL25ld3MvYWN0aXZpdHkvNzM1NTYxLmh0bWw=&lType=initiate&lResponse=1
    [token:protected] => 
    [application_key:protected] => 02ga5sjqn6es
    [application_secret:protected] => IZCHAW3uRG8LxGzu
    [response_format:protected] => xml
    [last_request_headers] => Array
        (
            [0] => Authorization: OAuth realm="http%3A%2F%2Fapi.linkedin.com",oauth_version="1.0",oauth_nonce="18b1451781dd267e3f295a9da060aad8",oauth_timestamp="1597509957",oauth_consumer_key="02ga5sjqn6es",oauth_callback="http%3A%2F%2Fm.biodiscover.com%2Findex.php%3Fr%3Doauth%2Flinkin%26url%3DaHR0cDovL20uYmlvZGlzY292ZXIuY29tL25ld3MvYWN0aXZpdHkvNzM1NTYxLmh0bWw%3D%26lType%3Dinitiate%26lResponse%3D1",oauth_signature_method="HMAC-SHA1",oauth_signature="UJWDCF5JFWq%2BPoC1LwBXotAYFqs%3D"
            [1] => Content-Type: text/plain; charset=UTF-8
        )

    [last_request_url] => https://api.linkedin.com/uas/oauth/requestToken
)