Qt License error while running moc

I have already opened another ticket but I wanted to provide other information

While running all moc for my ui files, my  build script is reporting 

Jamfile</>.moc_make_vmpxFile /teams/backuped/tnd/fabricet/sandbox/STREAM-v25_0_0/rnd/software/vmpx/moc_VMPX_UpdateFirmwareGui.cc
Error while initializing license client: Could not acquire lock file for client. Some other process might be using it.
Error! Cannot acquire license to use qtframework.

If you have a valid commercial license, please create a bug report to Qt Bugtracker:
https://bugreports.qt.io/projects/QLS

Attach the above error details to the bug report.

Additionally, attach the qtlicd_log.txt file of the Qt License Service that can be found from the directory of this Qt installation.

This issue occurs after migrating from Qt5 to Qt6.
We never had such issues with Qt5 and we still do not have it using Qt5

This is critical for me as I need to integrate my changes for QT6 and due to this error, I am reluctant to integrate these changes

Can you please help me on this subject?