I am having the same issue. It started with the 6.6.5 update.
data => Array
results => Object WP_Error
errors => Array
site_verification_failed.missing_url => Array
0 => Unable to determine if the scan target is allowed: Missing scan URL.
error_data => Array
site_verification_failed.missing_url => Array
url => https://www.*****.com
cached => [boolean] false
