Hi @thestraycat, we're still investigating the issue since using nssm is not officially supported on Windows 10.
As a temporary workaround, considering that the scope of having it installed as a service it to just have it started at the boot, you might consider to add the TeamRender Client executable among the programs being run at the startup: this can be done be creating an alias to the program - in your case the TR client - inside
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\StartUp or, if depending on a local credential, in
C:\Users[local user]\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup.
Finally, although it doesn't change the overall results - I warmly invite the drop
nssm and have a look to
sc.exe which is a similar utility provided directly by Microsoft and delivers the same functionalities delivered by the first.