Disable screen timeout in lockdown

I'm having some trouble with getting the screen to not timeout when in lockdown. I have the Authentication profile pushed out with "disable lock screen" selected. The phones will be on person most the time so the Feature profiles "keep screen on while charging" won't be so helpful. I have attempted pushing out the script "writesecuresetting - sys screen_off_timeout 600000" for a 10 min screen timeout, but it never changes the settings on the phones we are testing with. I'm not sure if that is a generic android script that will work on any device or for Zebra phones that I have successfully used it for previously or the Authentication profile is blocking it in some way. Devices: Pixel 5 and Spectralink Versity 9553 Mobi Agent:  14.4.6 Build 1001 (Spectralink requested the apps be set to not update) 14.5.0 Build 1011 (Pixel is not being restricted) Mobi Server: Version: 15.2.2.1080 (Cloud)