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Thank you in advance for your patience and understanding on the matter.
Thank you for the reply Igor.
I had alread found the article you mentioned
Using phpMYadmin I looked directly at the table psa.ServiceInstanceProperties and I see only two known domains which have no issues
There does not appear to be anything with values missing.
Simplest solution for me, although not the best one as it does not fix the core problem but at least gets the domains onlie and active - as they had no hosting I simply deleted them from plesk and re-added with hosting which seems to have solved the problem in the short term.
I would still like a proper fix for this as the KB article does not provide a solution