@NIKHIL C - Thanks for the question and using MS Q&A platform.
The error you received is caused when normal users do not have permission to add/register any Microsoft Entra ID application by themselves.
To disable the default ability to create application registrations or consent to applications, follow these steps to set one or both of these settings for your organization: Go to Microsoft Entra ID => Under Manage => select Users => Under Manage => select User Settings as shown below:
Note: You can ask the admin to set it to yes if this is the requirement for your organization.
For more details, refer to Delegate app registration permissions in Microsoft Entra ID.
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