I shared the troubleshooting steps they suggested here:
Left the preview but everytime i load the sim it’s still going in the 1.0.88 build with modes being locked down? - [MSFS 2024] Bug Reports - MSFS DevSupport
This has obviously nothing to do with the SDK/DevMode and not something we can investigate ourselves so the best I can do for now is stay in touch with them and share any progress on the subject.
Regards,
Sylvain