I did as you suggested - unfortunately without any success.
To further check I did copy all consolewd files including the ones in the deploy folder from the working x86_64 kernel based NAS to the other NAS that is aarch64 based, unfortunately without any success, too.
So what I can say for now is:
The 64 bit consolewd is running on x86_64 kernel based NAS Synology DS216+II.
The 64 bit consolewd is not running on aarch64 (ARM64) kernel based NAS Synology DS128play.
Is there any way you could compile a version for the ARM64?
Thank you for your support
Urs