SharePoint 2013.
We have a strange issue going on in our environment. We have Microsoft involved. Workflows that contain “send an email” stopped working. The email will send an email to active directory groups, but not to individual accounts. Â I’m able to start a workflow but it ends up going to suspended status. When I look at the error, it reads “value cannot be null“. When a user submitted an item, the error came back with Http 401 error access denied. You do not have permission to perform this action.
We have had a problem with our user profile sync not working before this issue. It is working again. We have ran a full sync.
Has anyone ran into this before?
You should still be able to pick the email address for created by. Â
Thanks for your reply. We do use the user id currently. It’s like the user id is not corresponding with the email linked to the user ID. When I used the email address I did receive an email. Unfortunately that will not work for us when we use a created by.
We had this happen in one of our farms.  Are you using SharePoint Designer 2013 workflows?  If you are,  I may  have a fix for you.  When you do the look up person, instead of email address for the return field, use User Id’s, semicolon Delimited.  This fixed it for us. Â
