Hello Elena,
Thank you for reaching out to Atlassian Community!
On Jira Service Desk, currently, there is no option to track if a notification was delivered and if it was read.
There are feature requests suggesting improvements for that:
Please, click on vote and watch to receive updates about the features.
As a workaround, it's possible to use an add-on. I found one that may help you:
Regards,
Angélica
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