Hi Chris, welcome to the Community :)
As you said, you need to have an Atlassian account to register Sourcetree upon installation. If you have a Bitbucket account, that means you already have an Atlassian account (they share the same credentials). If you don't you can create your Atlassian account via My Atlassian.
Let us know if this helps!
I agree. Though I am starting to see this as a SourceTree Issue. I.e. Sourcetree should support Okta, and if it did, that should alleviate the issue here. Or at least that would point the issue back at Atlassian, if their API's don't support 3rd party Okta logins. (but I assume they do)
You can use this https://confluence.atlassian.com/bitbucket/app-passwords-828781300.html to create an app password for source tree. My users had had the issue and we bypassed it by creating app password. In fact, not every single app supports OKTA's sso.
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