First check SteamVR support wizard https://help.steampowered.com/en/wizard/HelpWithGame/?appid=250820

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Prior causes/fixes of SteamVR Error 200, -203, 204, 208, 210, 215:
AMD GPU error 200, change bitrate ( https://gtm.steamproxy.vip/app/353380/discussions/11/4038102936180242093/ )
HMD plugged into motherboard instead of GPU
GPU drivers. Do a clean uninstall and install of the latest,
Use a different port on the GPU,
Plug in only 1 monitor, try different refresh rates on it.
Bad adapters on the video cable,
Linkbox issue (bypass it) ( https://gtm.steamproxy.vip/app/250820/discussions/0/4356743146672090646/?tscn=1711568860 )
Pet chewed your cable,
SteamVR overlays of any kind (ovr, etc),
Security software,
Auto-overclocking software (like Razer Cortex Auto Boost)
Enabling re-projection on WMR
Enabled Hardware-accelerated GPU scheduling (disable HAGS) ( https://gtm.steamproxy.vip/app/250820/discussions/2/3187992458108815903/?tscn=1708472861 )
Optimizations for windows games in GPU options (disable it) ( https://gtm.steamproxy.vip/app/250820/discussions/0/4293692546845646378/?tscn=1711311480 )
Laptop video port not directly controlled by GPU
unconfirmed: try running steam as admin
Thunderbolt port is not SteamVR compatible with i12 cpu or later ( https://www.reddit.com/r/Vive/comments/17v59wn/vive_pro_2_black_screen_error_210/ )
ref: intel gen
error 215 from windows internet set to public instead of private ( https://gtm.steamproxy.vip/app/250820/discussions/0/4036979713112601939/?tscn=1704207190 )