You can use the web version of the Sucuri Scanner [1].
The scanner says that your website is returning a “403 Forbidden” HTTP status code when the User-Agent in the HTTP request is faked to pass as if it were one of Google’s Web Crawlers.
I already explained the issue with more details here [2].
[1] https://sitecheck.sucuri.net/
[2] https://wordpress.org/support/topic/unable-to-scan-the-page-403-forbidden/#post-10842679
Thank you for the quick response!
Issue not solved. Click below for current situation.
Unable to Scan Page. 403 Forbidden Error
Amazon EC2 Abusive Report
Sucuri: Please fix this. You need to use your own servers and/or provide an option in your plugin to limit the number of malware scans (e.g., X per day/week/month, etc.)
Recommend contacting Google, Amazon, iThemes Security, and Cloudflare to solve this.
Thank you!