Thanks for the feedback.
For further analysis, can you please send us the spacedesk diagnostic files with the settings changed.
Just recreate the settings (with viewers connected) where touch did not work then open the spacedesk Driver Console -> Diagnostics -> Save All Information.
PS: Saving all information will take a few seconds, then please send us the whole folder which contains all the diagnostic logs collected.
Please right-click the folder -> Send to -> Compressed (zipped) folder, then attach the *.zip file in your next reply.