I have had an issue with an application pool crashing with an error saying the identity of the application pool is invalid. After changing the username and password multiple times it became clear an incorrect password is not an issue.
The application pool was actually running as a local user on the web server. In order for a user account to be used in an application pool it needs to be added to a local security group (I have never done this before so its certainly not always the case).
To get it working be sure that the account is a member of the local security group "IIS_WPG", for membership in the IIS_WPG group is needed to run the w3wp.exe worker process.
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