I have created a sharepoint designer 2010 .workflow in sharepoint online and kept a email action to see if the workflow works.but the email are no firing but it seems to be working fine with sharepoint designer 2013.
What could be wrong with it ?
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User initiating the workflow does not have required permissions. To avoid this, Please run the send email action under "Impersonation step" and then publish the workflow
Issue may come if particular user's mailbox is not configured properly.
Keep an eye on how your designer WF is getting fired? Manual/Itemcreated/Item edited. and try to create an entry in Workflow History List
and Lastly, try to update some field value of current list item by running the action "Update xxx in current item". This will ensure that if there is some problem with Workflow OR it lies only while sending email.
Hope this helps!