Hello ,
After investigation by our team, we have found that this issue seems to be caused by using an older version of Windows 10. As we moved to Unreal Engine 5.1, the Windows OS system requirements were updated to require Windows 10 64-bit version 1909 revision .1350 or higher, or versions 2004 and 20H2 revision .789 or higher. Please use Windows Update to update your OS, which should resolve this issue.
If updating Windows does not resolve the issue, please submit a bug report here and share a copy of your Twinmotion.log files (Where to find Twinmotion .log file) so we can continue investigating this issue.
Please let me know if you have any questions or concerns.
Best,
Raghib