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kotha ramyakotha ramya 

am getting unsupported  type error while am trying to authorize the org in sandbox environment

Khan AnasKhan Anas (Salesforce Developers) 
Hi,

Greetings to you!

Please refer to the below link with a similar discussion which might help you further with the above issue.

https://salesforce.stackexchange.com/questions/223205/sfdx-grant-type-not-supported

I hope it helps you.

Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future. It will help to keep this community clean.

Thanks and Regards,
Khan Anas