Once one has enrolled for the HMRC Agent Account Manager (AAM) scheme, how does one contact one's AAM?

This is what I use

https://online.hmrc.gov.uk/shortforms/form/AAMIssue?dept-name=&sub-dept-name=&location=43&origin=http://www.hmrc.gov.uk

On occasions I've had to prompt more than once but, in all cases, the issues have been resolved, reasonably quickly.