I was able to send email invite to email and calendar suddenly it stopped,
1. Send event invite to invitees not working
2. send teams link to invitees or send teams link to host for schedule
- i could send this link but the invitees from sharepoint form are not populating, that is before it stopped emails.
3. My timezone not matching the invitees timezone.
(this is my teams link) trying to work out timezone format and time to match start and end time.
https://teams.microsoft.com/l/meeting/new?subject=Title%20subject&v_Invitees_Email_Address=invitees%20Email&startDateTime=10%2F24%2F2018%2010%3A30%3A00&endDateTime=10%2F24%2F2018%2010%3A30%3A00&content=test%3Acontent


