Hi @Bakhtawar Tanveer
Welcome to the Atlassian Community!
Yes Access is the way to go to enable your SSO for the users.
1. Check here Manage your bill for Atlassian Access
It tells what kind of user is identified as a billable user - as overall the billing cost depends on the number of unique billable users; and billing cycles - monthly vs annual
2. If your internal customers have no product access yet, they won't be considered as billable users. Hence no cost associated with this number of users.
3. If you check the link below you can find SSO configuration steps.
Atlassian Access policies and features apply to all the managed users with access to JSM in your case.
For internal users
SAML single sign-on for your organization’s users:
If you’d like your users to authenticate through your company’s identity provider when they log in to your Atlassian cloud products, you can set up SAML for single sign-on (SSO). SSO allows a user to authenticate with one set of login credentials and access multiple products during their session.
With SSO, you have a few benefits:
If self signup is enabled, we automatically create an Atlassian account for them when that user logs in for the first time with SSO.
You can set security policies from your identity provider that will apply when users log in to your Atlassian products
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.