Hello LeanIT,
welcome to the Polycom Community.
A single community member MDominik13 opened 1-731244691 as advised but checking the case it seems a different issue was discussed but never followed up by MDominik13 itself.
Without this we are unable to verify this issue.
As already outlined we therefore require you to raise any issues via your Polycom reseller so they can open a ticket with Polycom support.
I have heard of a similar issue internally, VOIP-98691, but in order to verify this we need you to escalate this as described above so we can compare your findings. Please make sure your reseller quotes this number.
Please ensure you provide the per device LYNC license or LYNC order SKU when you raise a ticket via your Polycom reseller with Polycom support.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services