Symptom
The sync panel does not display the name of the synchronization, and the project key on the Synced with section does not contain a clickable link to the partner project:

Explanation
There can be multiple reasons why this occurs:
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The issue has been moved out of the project.
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The synchronization has been deleted.
Solution
The synchronization user needs Project Administrator rights. You can remove the rights after performing the steps.
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Open the synchronization overview and find the affected synchronization
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Click on … > Edit > Save