Are you getting message notification emails?
Announcement emails are sent via cron. So it your website cannot run cron then it will not work. Make sure you have visitor on your website.
Please go to Front End PM PRO > Settings > Emails and see all fields are filled. also check if “Send email to all users when a new announcement is published?” is checked.
Also change Front End PM PRO > Settings > Emails > Sending Interval to 5 and save changes. it will try every after 5 minutes. Then after 5 minutes refresh your page and see if emails sending. You can see how many email pending by go to Front End PM PRO > All Announcements.
If still not works please follow https://www.shamimsplugins.com/docs/front-end-pm-pro/troubleshoot/email-notification-not-receiving/
Let me know.