Yes, i have sent an announcement to admins and vendors and as my account is set as vendor, i have received email.
Please check yours and let me know.

I can not recall what plugins was activated before, I have activated most of the plugins. You can activate others if you want. But please take a note which one you are activating, so that if any issue arise i can look there.

My suggestion if you activate any plugins, create a test vendor account, activate plugins one by one and send a message to vendor after activate any plugin. and see if you receive email notification as vendor.