Go to your Wacom tablet properties:
In “ Pen” mode, you use the pen like a regular pen, and you interact with the device as if it is your paper. Each point on the device maps absolutely to a specific point on your monitor, and the cursor jumps to the corresponding point on your monitor when you place your pen on the device.
Attempts to write with Wacom pen on Whiteboard or Blackboard in Virtual Classroom May fail if the "Use Windows Ink" is enabled in Wacom Settings.
Disable "Use Windows Ink" in Wacom Properties Settings:
Update the Wacom Driver