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SONAL GSONAL G 

After sandbox refresh, the scheduled jobs are not running.

Hi,
I have schedulable apex class included in manage package. Scheduled job run every 15 minutes after package installation.
However after sandbox refresh, the scheduled job is not running.  I checked 'Scheduled Jobs' listing. On listing, job name is there and its say it has run today and scheduled for tomorrow. But my apex class are not executing and no record is created in AsyncApexJob table.
NagendraNagendra (Salesforce Developers) 
Hi Sonal,

I have come across this issue in the past. The quickest fix was to simply get rid of the existing jobs and schedule them again. 

If you want more insight on it, you could log a case with Support.

Hope this helps.

Mark this as solved if it's resolved.

Regards,
Nagendra.
@GM@GM
Hi Sonal,

I came across this problem last year and I have confirmed this with salesforce support that it’s known issue.
The scheduled jobs won’t be running in sandbox but still you will find the scheduled date and next running date keep on updating.

As suggested by Nagendra, reschedule it in the sandbox.

Regards,
GM