In my environment when I go to CA > Manage Content DB settings; the preferred server for timer jobs in the dropdown is not shown and is empty. Also OOB timer jobs which have job lock type of content database, do not run and I cannot see them in the history or failed jobs page even after running them manually.
Here is what I have tried:
Reset the timer cache on all SharePoint servers (2 FE + 2 APP) by removing and regenerating the XML files
Running Products configuration wizard
Any suggestions to help resolve this issue? And what could be the cause?