@SBK
It runs successfully:

curl -m 20 -s -u ZBjlLzGSC5:MB9rPpfVAUjwZO12RmqsI7bLJcWTiQGED5HleaF3 --connect-timeout 10 -X POST https://www.foxymon.com/receiver/receiver2.php -F function=receive_binary_location https://downloads.outagesio.com/otm/otm_1.67.2104_linux

I created a new agent and it worked with no issues, so I'm good to go now.

~cwa