Unattended Access: Linux (Debian Stable) host (with GDM3 GNOME GUI) + no monitor, won't display

As the subject says, I am running into an issue where the log files are saying that ZohoUA can't find a monitor (because there isn't one connected). I still need a virtual adapter of sorts so I can see the screen at a client's remote site.

Here is what the log files from /var/log/ZohoAssist/rds.log

2023/01/27 23:31:43 7f8d4315b3dd1dd6b9b39e4ebf7456e2 [[ Error occured in finding display Unable to find any display or xauthority]]
2023/01/27 23:31:46 7f8d4315b3dd1dd6b9b39e4ebf7456e2 [[ Error occured in finding display Unable to find any display or xauthority]]
2023/01/27 23:31:49 7f8d4315b3dd1dd6b9b39e4ebf7456e2 [[ Error occured in finding display Unable to find any display or xauthority]]

This results in just a gray screen when I try to connect to the GUI desktop, that looks as such

This is in a server room with very limited space and it's states away, so "just hook up a monitor" isn't going to cut it, sorry.

Please advise. I have already restarted the ZohoAssistUnattended service

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Release Notes: Version 1.91, February 2015
Unattended Access (Beta) is live! Unattended Access, a feature requested by a lot of our customers is live now. Currently, it's in beta. You can add up to 100 computers per Technician subscription. They can also be accessed by your organization members. My Computers list in Zoho Assist home page will always display the online status of your unattended computers. You can rename the computers whenever you wish. Currently, Unattended Access can be configured only for Windows computers. Nevertheless,