During provisioning of PBA-S subscription to PPA 11.1, task "
Add the IP address to reseller's IP pool" initially fails on PPA side with the following error:
Reseller with external id does not exist
After some time, the task is completed successfully on its own.
Such behavior was considered to be a software issue that will be fixed in further Parallels Plesk Automation update released after 11.5. Here is bug id:
PPA-32 - PBA-S fails to clearly activate PPA reseller's subscription, because of async run of dependent tasks
The "Reseller with external id does not exist" error does not affect PBA-S subscription provisioning to PPA in general - after some time the task is completed successfully on its own.