Hi popvm
As per logs I suspect it a display driver issue:
2020-05-28T21:46:10.658+10:00> LVL:0 RC: 0 EXTERN :svga_devtap ==> svgadevtap: BlankHostScreen m_Displays empty
2020-05-28T21:46:10.658+10:00> LVL:0 RC: 0 EXTERN :svga_devtap ==> svgadevtap: usermode backend init failed
2020-05-28T21:46:10.658+10:00> LVL:0 RC:-500 IMG_FRONTEND :cSW_HOST_FRONTEND::open_display - Error attaching to SVGADevTap, error 1: Failed
2020-05-28T21:46:11.665+10:00> LVL:0 RC: 0 EXTERN :svga_devtap ==> SVGADevTapCountDisplays: new device NVIDIA GRID T4-4Q, name \\.\DISPLAY5, deviceID PCI\VEN_10DE&DEV_1EB8&SUBSYS_130E10DE&REV_A1 flags 0x80000
> Displays overlap issue occurred and could not be enabled within the 10 retries.
2020-05-28T21:46:26.241+10:00> LVL:0 RC:-500 MGMT_IMG :cSW_HOST_IPC::enable_frontend failed. All 10 retries failed.
2020-05-28T21:46:26.241+10:00> LVL:0 RC:-520 MGMT_IMG :Fatal error: cannot open svga frontend. Notifying session manager to close the session.
> Since PCoIP unable to connect to svgatap, session failed with disconnect cause 202:
2020-05-28T21:46:28.254+10:00> LVL:2 RC: 0 SERVER :server main: cb_notify_session_status called (mask 0x10) with tera_disconnect_cause (0x202)
2020-05-28T21:46:28.254+10:00> LVL:2 RC: 0 SERVER :server main: TERA_MGMT_SYS_SESS_EVENT_RESET with disconnect cause (0x202).
2020-05-28T21:46:28.254+10:00> LVL:1 RC: 0 SERVER :map_tera_to_agent_close_code: TERA_DISCONNECT_CAUSE_HOST_SVGA_FRONTEND_FAILURE -> PCOIP_AGENT_CLOSE_CODE_BROKER_INITIATED
> Disconnect cause 202 means (VMware Knowledge Base ) :
The PCoIP server front end failed to open displays on session startup. This could be a security problem, a bad driver, an application running in full-screen mode, or other problem that needs to be investigated. Without a source of pixels the PCoIP session will be terminated. Two other scenarios that can cause this error:
1)When 32 bpp is not supported by the video driver on Graphics Agent
2)When 32 bpp is not supported by Standard Agent because the tera svga video driver is disabled for some reason).
> Test with SVGA driver opposed to vGPU driver to isolate NVIDIA driver from being cause of the issue (VMware Knowledge Base ). You can update the driver and test.
> If running multi monitor setup, test with single monitor and see.
> Make sure video memory on the machine is set to 128MB. If not increase it and test again.
> Make sure you install NVIDIA driver after horizon agent installation.