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When someone is becoming the default publisher for the virtual appliance versions that are published from the continuous delivery, it means that he/she had permissions to manage virtual appliance version at that time.
It is possible that in the mean time another user had revoked his/her related permissions. There are two ways to overcome this issue:
NOTE: If this issue is kept unresolved for a long time, it is possible that the continuous delivery backend will automatically pause the process, until manually resumed by the author.