The option to “discard” suggested contacts in your chat list is rolling out to users. We will be making further changes to make suggested contacts more relevant for new users in the future as well, so marking as partially completed. Thanks for your patience with this one.
~Alex & the Teams teamKat Seaton commented
Many of the suggestions in my chat window are personnel that are no longer employed in the company. Many of whom have not been employed for years. (Many that were not employed with the company before we switched to office365)