There are two key things to think about in particular for Okta:
No "Application Button" for Opsgenie
Context
Atlassian has not updated the Atlassian Cloud app in Okta to support OpsGenie as an "Application Button" (for list of applications that are supported to display to the end user).
Example Screenshot

No "Embed Link" for Opsgenie, only Jira
Context
It appears Okta / Atlassian has not updated the application development of the Atlassian Cloud app to enable other programs besides Jira, though, if we also wanted to make a bookmark application for end users for those solely allocated of Opsgenie.
Example Screenshot

Opsgenie has reached end of life.