i changed my duplicati webpage password and my cloud folder remote-entry password and cloud-controlwebpage password, they where to old and easy… lot’s of free time due corona for the “hackers” so i updated some security-levels.
(i didn’t know that there was a third place for a password, encription password.)
i have a exported job configuration imported it placed the latest passwords in it and renamed it back up 2020.
Duplicati is now deleting remote files and former job configuration, the one who’s acting up. So if i am right my job backup(which i imported to create a new job is a clone of the problem version except the passwords. So i just wait until the deleting of the old job is done and see if the new job will Run without errors.
(update: before posting)
and yes it runs a back up at this moment.
checked the cloud folder and it’s filling up.
(lucky i back upped the backup-job settings 
)
So if i have this problem and i am content with a fresh backup easiest way is create a new job from a job export(backup) rename it preset year. delete the other job including the remote files.
Thanks for your help.