Hi @Ash ,
This is Lokesh here from miniOrange one of the top SSO vendors in the Atlassian Marketplace.
We have an SSO plugin for JIRA and JIRA Service Management that can fulfill your requirements. This module support user provisioning so even if the user is not present in JIRA (or connected AD) they will be created on the fly in the internal directory (or you can specify the directory as well).
In case if their third-party users have their own IDP, you can connect it along with your organization's IDP for SSO.
I suggest you drop an email at firstname.lastname@example.org or raise a support request on the customer portal so that can discuss the requirement in zoom and help with this requirement.
There are a number of SSO apps in the marketplace. IF my memory serves me well I believe many allow you to connect multiple IdPs. This means you would add third-party users SSO. The issue I think you will run into is getting the third-party security team to release the necessary information to connect their IdP to your application.
If you have a variety of 3rd party users, then running your own IDP is the best bet. All current Atlassian DC products now support multi-IDP for SAML, so you can natively connect to your AD + other IDPs for SAML
Depending on how many other parties are involved, and how many users there are from each party will impact the level of effort involved.
I'd see an ideal solution as something like:
I do not work for Okta, it's just the solution I'm personally familiar with.
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