Hi,
thx for creating this extension - unfortunately I cannot get it to run on our wiki barcamp.at - could it be that there is an issue with the documentation? Actually there does not seem to be a hook called
Hooks::run( 'SendPersonalizedNotificationEmail',
within your extension, but a hook called
Hooks::run( 'SendPersonalizedNotificationEmailDiff',
(based on the function with the same name?)
Any hints regarding debugging your extension would be appreciated!