Email Extension plugin failing to send emails with the content of Jenkins environment variables .

I have attached the configuration of a job for post build here. We are using jenkins 2.289.2.

 Please advise

Following how my configuration looks like
 

Editable email configuration project level(picture attached):

$PROJECT_NAME - Build # $BUILD_NUMBER - $BUILD_STATUS.<br/>
<br/>
Check console <a href="$BUILD_URL">output</a> to view full results.<br/>
If you cannot connect to the build server, check the attached logs.<br/>
<br/>
--<br/>
There are ${TEST_COUNTS, var="total"} total tests of which ${TEST_COUNTS, var="fail"} test(s) failed.

After successful build we are getting email like below (picture attached).