Maybe that wasn't possible/enabled for our particular deployment (that was in the IT dept. of a big European bank), as we had what I've been told was a strange bastardization of O365 and other MSFT services - a mix of on-prem and cloud services unlikely to be found elsewhere.
At any rate, for the IRC server at the shop I was at previously, I had "webhook" support/a http(s)->irc gateway implemented on my own in much less than an hour via CGI ;)