Hello @codexrahul ,
There was Servicenow internal error and they also announce about it :
https://www.servicenow.com/community/developer-blog/incident-developer-site-restored-and-pdi-availab...
You can also refer this :
https://www.servicenow.com/community/itsm-forum/pdi-access-issue-servicenow-announcement/td-p/357818...
But now its restore because my instance was also went to hibernate ,now it come back and its working fine . If your instance is not come yet so keep patience , it will restore soon .
If this helps you then mark it as helpful and accept as solution.
Regards,
Aditya
