Synchronization between two instances requires a configured Connection.
One side needs to initiate the connection and send an invitation to the partner (the Destination instance).
The other side, needs to finish the configuration from their side.
You can synchronize with different issue tracking systems. For more details check typical use cases.
Start synchronization with your partner
To start a synchronization with your partner - Initiate Connection.
Have an Invitation code?
If you have an Invitation code - Accept an Invitation.