What we want to achieve
Giving different Jira Service Desk customers access to issues and requests concerning a application or service.
Is it possible to give customers in a Jira Service Desk project access to a specific application based on a value in a custom field or a specific component value or similar?
It sounds like based on a field value you want to provide access to external apps? If such case you may need to have an automation in the Jira Cloud which will grant access for a user to the remote application. The remote application should support API for users management/enablement and in general it might be achieved. But I don't believe such users management model is either robust, secure or fail-safe.
Or maybe I just didn't get right the workflow you are pursuing here.
I might be explaining it wrong:
"The Company" is doing support for "System 1", "System 2" and "System 3". Customers/end user contact "The Company" when having questions/issues with one of the 3 mentioned system examples.
In Jira Service Desk, "The Company" have created a custom field of type Select list (single choice with "System name", where option for values are "System 1", "System 2" or "System 3". This field is used for tagging a ticket in JSD, describing which of the systems the customer/end user is submitting a ticket on.
Based on the value options in that custom filed, is it possible to give e.g. "Customer A" access to viewing only tickets tagged with "System 2"?
Alright, now it is more clear. Unfortunately I do not believe it is possible (or I just don't know the way). If it would be simple Jira Software/Core project then you can try to utilize issue security levels. But it supports only group or user fields which implies manipulations with groups membership through automation, which is not safe users management model. Plus, in JSD you should also consider user's access based on the JSD project settings and organizations, which adds even more complexity.
But it would be helpful if you can update the initial question, so others will get the idea of what you are trying to achieve.
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