Try URL or manual entry.
You may have found the cause with those missing values. Perhaps the LTI instance is not quite configured the best in canvas or they don't support grades. We can find out as we test with the test tool
Hi John
I am able to fix it. Issue was with the timezone and time. Time difference between the Canvas and Moodle server should not be more than 5min.
If you want to increase, please change below lines,
protected $timestamp_threshold = 300; // in seconds, five minutes -- line number--->447 in local/ltiprovider/lms-blti/OAuth.php.
Thank You..