Aha! takes my email address as user name but TFS requires <DOMAIN>\<Last Name> as user name. Therefore the integration throws errors when an Aha! user is set in the TFS "Assigned to" field of a feature.
My suggestion to solve this is to
With these options it would be possible to automatically convert Aha! user "John.Doe@company.com" to TFS user "company\doe", which will be placed in the "assigned to" field of a feature.
Thank you for your idea. It is currently possible to map the Assigned to field to a custom field or to map the TFS assignee to a custom field in Aha!
Given that the format of the user name in each TFS setup may be a little different, and the ability to map using custom fields, we are unlikely to implement this idea at this time. We hope you can understand.