The following error occurs during an attempt to create a domain with the national symbol - 'ø'.
ERR [panel] Domain update failed: Unable to update domain data: Unable to add the example.com. IN TXT v=spf1 mx ip 203.0.113.2 a:example.com -all record to zone example.com: Incorrect DNS record values were specified.
The follow TXT record is set under Tools & Settings > DNS Template :
v=spf1 mx ip4:203.0.113.2 a:<domain> -all
This is Plesk bug with id #PPPM-7199, which is planned to be fixed in future Plesk updates
The possible workaround is to delete SPF record under Tools & Settings > DNS Template