Thank you for posting this in Microsoft Q&A.
As I understand you are trying to configure Group claims in Azure portal for one of the enterprise applications that you have configured. Now, you are seeing the above option that you have mentioned in above screenshot is greyed out.
Basically, this option will be enabled only if you are selecting "Source Attribute" as one of the on-premises attributes which is available for groups. This means this option will be available only to the groups which are synced from on-premises directory and if you select the "Source Attribute" as one of below attributes,
If you are selecting the options Group ID or Cloud-only group display names, then the option "Emit group name for cloud-only groups" will be greyed out.
Only if you select any of the above marked attributes, this option will be available.
Let me know if you have any further question, so that we can discuss offline.
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