That is what I have been trying to most. Both at the ADS level, and at instance level. Nothing seems to work.
I just tried again (at the ADS level), and this is the Audit Log:
And this is the log file:
Aaaaah the problem is that multiple licences are present! The presence of the standard licence is applying restrictions. Delete the licence files from the ADS instance and reactivate it.
Cool. How do I do that, please?
Edit: Ah, I am assuming I need to delete the ADS01\Licenses\AMP\*.lic files?
Correct 
then reactivate again.
Cool, I’ll try that as soon as I can. Thank you, so far
EDIT: Yes! It finally worked. Thank you very much!