User-added image

Check the Website Redirects by navigating to onMessage > Settings > Website Redirects and look for the same or similar URL

Ex: There are two redirects set up for the same URL:

http://www.schoolname.org/pagename redirecting to /Page-Name

A second redirect is set up, telling the original page URL, to direct to the original page URL.
http://www.schoolname.org/page-name redirecting to /Page-Name as well

This causes a redirect loop "ERR_TOO_MANY_REDIRECTS":

User-added image

After removing one of the redundant redirects, it should work without issue.