Comments not working
For those who are having issues adding a comment.
The only thing I can find about comments not working, is where Third-Party Cookies have been blocked.
To makes comments available again, you may need to clear browsing data and than allow third-party cookies.
A YouTube how to allow cookies
From Google
To comment under your Blogger name, you must enable third party cookies. Remove the check mark from Cookies. If you prefer to not allow them, you can add exceptions.
Test comments below!