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 teamWalter Thompson commented
There is a github link to remove suggested contacts, but I'm not brave enough to try. If anyone else does, please post back here:
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook-mso_win10-mso_365hp/removing-suggested-contacts-from-my-outlook-365/ca5b151d-f536-4baf-b926-5a1ac03c80d8Walter Thompson commented
Until whomever's darling 'suggested contacts' is no longer works at Microsoft, we probably need some sort of a workaround. Isn't there a registry entry to remove it?