The new Azure PowerShell "Az" module has been released. As a result, we're deprecating the AzureRM.ApiManagement module. There will be no new development into AzureRM.ApiManagement. All new changes will go to the new Az.ApiManagement module.
In addition, we've removed a number of old cmdlets in the new Az.ApiManagement module. For details, see this documentation.
If you're using the old module, we suggest that you migrate to the new module at your earliest convenience.