I'm getting a Health Rule throwing the error in the title. Full details on this:
MidTier process account should have 'Full Read' permission on all associated SPWebApplications
It also gives a link for reference, basically saying that the Service App Identity for the PowerPivot Service Application needs to have "Read-Only" permissions to all web applications.
I've determined this by examining the application pool that the PowerPivot SA (PPSA) is running under, going to Configure Service Accounts and finding the account for that application pool.
I've added this account to have read-only permissions under "User Policy" for each and every web application and the health rule still persists.
Any ideas on how to fix this? I've run a full crawl and rebooted the box in addition to attempting the "Auto Fix" for the rule.