OpsGenie can use SAML SSO without the use of Atlassian Access, see the following url: https://docs.opsgenie.com/docs/single-sign-on-with-opsgenie
For the configuration part of Workspace ONE Access just add a new manual SAML 2.0 application and provide the following information according to above article:
- Single Sign On URL https://app.opsgenie.com/auth/saml?id=”uniquesamlidprovided
- Recipient URL https://app.opsgenie.com/auth/saml?id=”uniquesamlidprovided
- Application ID https://app.opsgenie.com/auth/saml?id=”uniqesamlidprovided
- Username Format = Unspecified
Username Value = ${user.email}