Hello Chetan M,
Thank you for reaching out Microsoft Q&A.
Based on the information provided, it seems that the Add role assignment option is grayed out and disabled. This typically occurs when your account does not have the necessary role permissions for the subscription or resource in Azure.
To confirm, check if you have any permissions assigned at the subscription level. If permissions are assigned, what specific role do you hold on that subscription? Note that being a Global Administrator will not grant the ability to assign roles.
To assign Azure roles, you must have:
For Additional Information you can follow:https://learn.microsoft.com/en-us/azure/role-based-access-control/role-assignments-portal
Hope this helps. Do let us know if you any further queries.
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for was this answer helpful. And, if you have any further query do let us know.Regards,
Goutam Pratti.