Hello Gustav,
Since your build is 23612, suggest you first reset the Insider settings by deleting the Self Host Key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsSelfHost
Download the ISO for Release Preview 26100.560 and do a Repair Install.
Download Windows Insider Preview ISO (microsoft.com)
Mount the ISO and run setup.exe within Windows. This will put you on the RP build. You can join RP if you want, and WU will take you to 26100.712 which will be this fall Release of 24H2. I have not tried running WU without joining RP channel, you might want to try that first to see if the update comes down while in Release.
Regards,