Hi Roel78,
untagged RGB should be DeviceRGB and there does exist a check for the presence of DevRGB. In Acrobat Preflight, create a new profile, then a new check and search in Property for "rgb". You should get 4 entries, one being "Is DeviceRGB".
Add that and set it to "is true".
Save your profile and test it.
Perhaps this helps,
Ulf
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