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We have some quality issues with Chalk. Chalk sessions disconnect or fail.
In Detail, the Problems occurs during starting the Connection. As a result no Connection is established between the devices.
This problems are located in Germany and it is not a bandwidths problem.
Do you know about this performance issues?
Is there a roadmap for hosting the chalk server in the EU Cloud?
Have you tried the below Troubleshooting method?
https://community.ptc.com/t5/Vuforia-Chalk/Vuforia-Chalk-Network-Troubleshooting/td-p/655565