The task 'Update the web hosting settings of the webspace #101' failed with error:
Domain Service Web not exists: domain=example.com, id=#101
After that the domain 'example.com' displays to be without hosting.
Hosting type Forwarding for the main domain (first domain) under webspace was not supported in Plesk Automation 11.5. Main domain should always has "Website Hosting" type, otherwise PA will fail to apply limits for the subscription.
The situation was caused by software issues #PPA-636 and #PPA-875. The fix is included in MU #5.
Update PA installation to the latest version: