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Unable to activate or suspend a domain in Plesk: Some fields are empty or contain an improper value. (’email’ = ”)

It is not possible to activate/suspend a domain or a Plesk user account due to one of the following error messages:

Error: cObject::update() failed: Some fields are empty or contain an improper value. ('email' = '')

Error: cObject::update() failed: Some fields are empty or contain an improper value. ('displayName' = '', 'name' = '', 'email' = '')

DNS zone is not configured for the domain or email address is missing from DNS zone configuration.

Connect to the Plesk server via SSH (Linux) or RDP (Windows)
Create Plesk database backup
Log in to Plesk
Restore default DNS settings for the domain at Domains > example.com > DNS Settings > Reset to Default

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