How to enable “Modify All Data” permission for a profile in Salesforce Service Cloud
Salesforce has this thing called Profiles. With their help, you can define what a user can do in Salesforce. To have the tickets migrated correctly, before starting the Free Demo make sure that the profile agents belong to has: a) Salesforce license and b) Modify all data permissions on.
How to check profile license
To check if the profile has a Salesforce license, go to Users > Profiles or type Profiles in Quick Find.
There, you will see all the profiles you have in your Service Cloud and the license of each profile.
How to enable the "Modify all data" permission
Go to Users > Profiles or type Profiles in Quick Find.
Locate the profile you need to change and select Edit.
Once you have the profile open scroll down to Administrative settings (or use Ctrl/Cmd + F to search in the text), find the Modify all data and check the box next to it.
Salesforce will automatically check other necessary permissions. Scroll down to the very bottom of the page and click Save.
The last thing you need to do is check if all agents are assigned to the profile which has the permission to modify all data. You might have edited the profile, however, if at least one agent involved in the migration process has a different license and profile, data might convert incorrectly.
To check this, go to Users > Users. There you will see all users and profiles they have assigned to them. If everything looks good, you may proceed with the migration.
If you need to change the license and profile for the user, select Edit and do so. Don't forget to save the changes once done.
Now you're all set to start the Free Demo Migration.