I have the following configuration set and still Email and Task buttons not showing in the chatter lightning Lead Object:
1- Deliverability = All Emails
2- Task Has a record type
3- Feed Tracking is turned On for Lead Object
4- I have add Email and Task button on the Lead page layout in both sections 'Salesforce Mobile and Lightning Experience Actions' and 'Quick Actions in the Salesforce Classic Publisher' , and made sure that im viewing the right page layouts
5- I add Email and Task button to the Global Publisher Layout in both sections 'Salesforce Mobile and Lightning Experience Actions' and 'Quick Actions in the Salesforce Classic Publisher'
6- I do have Chatter Settings -> Enable Actions in the Publisher -> set to true
here screen shots
Screenshot Number 1
Screenshot Number 2
Screenshot Number 3
Screenshot Number 4
Screenshot Number 5
Screenshot Number 6
but nothing is working