...
Solution: Follow the steps below:
Export affected TM (click here see How to export a translation memory (TM) from XTM Cloud for help);
Delete affected TM;
Perform the "Search and Replace" option in the exported TM document and replace & with &;
Reimport the corrected TM (click here see How to import a translation memory (TM) into XTM Cloud for help).
Can the deleted TM be restored?
...
Customer that the TM is connected to,
Language combination,
Specify if the change only needs to be performed for the TM related to a specific project or projects (provide their names or IDs. Click here See How to find a project ID for help.) or all of the projects with this particular customer and language combination.
...