Instance Clone
Deep Clone for Jira can be used for cloning issues from one Jira Cloud instance to another.
Prerequisites
Both instances need to have Deep Clone for Jira installed
The user triggering the clone shall have access to the target instance and the appropriate permissions to create issues
For setting up instance clone, admin permissions are required on both instances
Setting up Instance Clone
Follow the instructions below to configure instance clone from e.g. first-instance.atlassian.net
to second-instance.atlassian.net
:
Ensure you have admin permissions in both instances
In
first-instance.atlassian.net
, go to Apps > Manage your Apps > Deep Clone > Instance Clone

Click on Add new target instance and enter the complete URL of the target instance, i.e.
https://second-instance.atlassian.net
Generate a binding key

Follow the instructions in What comes next? to finish connecting the two instances. If there is an error while submitting the key on the second instance, please generate another key and closely verify that the provided URL is correct
The instance
first-instance.atlassian.net
is now able to clone tosecond-instance.atlassian.net
. The other way around can be setup by clicking on Add as target instance onsecond-instance.atlassian.net
. Both instances are able to disable this connection at any time

In the Clone dialog, you can now select Clone to another instance… in the Target Project dropdown to clone from one instance to the other

There are some special considerations when cloning across instances:
Cloning reporters, @mentions, and other user values between instances
Request types and Issue types need to be available in the target project