You need to install the app first in Slack to connect with Jira
Please look at ref here for linking jira with slack
Hi @홍준_Ayden__사용자이해팀_Dreamus 민, does this fix the problem?
To be taken to the Jira mobile app from a deep link in a Slack message (rather than viewing Jira’s web version within a browser), adjust your Slack settings:
Open Slack on your Android mobile device.
Select You in the bottom navigation bar.
Disable ‘Open web pages in app’.
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