kamaldeepc​,I don't think working on a sandbox environment could cause such issues. Even if it does, it won't be an expected behavior and needs to be looked by ClientCare team to analyze and fix.

Hi kamaldeepc​,With Admin access you will automatically have all reports access and the error mentioned above is not possible.When you state that your account is setup as Admin, do you mean Admin under Analytics UI or the Marketing Cloud UI?Next steps from here could be to review the account access ...

Hi kbridges@evolytics.com​,If you could share the URL as DM to me, I can have a look and see what's causing the issue. You can also get a ticket opened with Adobe ClientCare through any of the Supported Users in your organization for analysis of this issue.

Hi jayak13010535​,If the issue is still not resolved, I would suggest posting the URL along with the steps to replicate the issue so that we can try troubleshooting the issue at our end.