Welcome to the community. By default if you comment on the issue where your customers created, you don't need to @ mention the customer when your comment is "Shared with customer" and not "Shared Internally". The customer who created or participating the issues will be notified automatically. He/she will also be able to access the issues via the portal UI.
Hope this helps and addresses your ask. If not, please provide more details on your ask, so we can assist you further.
Best, Joseph Chung Yin
Jira/JSM Functional Lead, Global Technology Applications Team
Viasat Inc.
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