In order to fix the issue, you should:
1. Update all Tasks so that the new Author Code is written in the u_fmta60.dta file:uxupd tsk tsk=*
uxupd tsk tsk=* ses=*
2. New Launches should include the correct Author Code.
3. In order to relaunch old Jobs that Aborted, you can create in the node a "dummy" submission account pointing to the old Author Code ( in case you don't know it check the u_fmsb60.dta file) .
In order to do so, launch the command:uxadd user user=dummy sysuser=XXX code=XXX
4. After doing Relaunch in the Job, you should be able to change the Submission Account to the correct one.