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Add email under activity on lead layout.

The email action was not visible under the activity on lead page layout.
Selected "All Emails" from email deliverability and the email action now able to see under the activity on lead.
But on going to email the error is showing "You can't perform this action on this page."(Please refer the below screenshot)
User-added image
What is the reason of this error and how can i resolve this?
SandhyaSandhya (Salesforce Developers) 

Try to  Disable Enhanced Email as suggested in the below link which worked for most of them.
Please mark it as solved if my reply was helpful, it will make it available
for others as a proper solution.

Best Regards,