Hello @Ziv Rivkis , the default claim schema configured for an Entra ID servicePrincipal
is part of the defaultClaimIssuancePolicy
which it's currently not available trough MS Graph. I'm reaching the appropiates team for more information about it's potential release date and will come back to you ASAP.
In the meantime you can find more information about updates to the MS Graph in the Microsoft Graph Changelog.
Let us know if you need additional assistance. If the answer was helpful, please accept it and rate it so that others facing a similar issue can easily find a solution.