A. Instruct users to implement a retry mechanism every 2 minutes until the call succeeds.
B. Instruct the engineering team to consume a random grant token from users, and to call the CreateGrant operation, passing it the grant token. Instruct users to use that grant token in their call to encrypt.
C. Instruct the engineering team to create a random name for the grant when calling the CreateGrant operation. Return the name to the users and instruct them to provide the name as the grant token in the call to encrypt.
D. Instruct the engineering team to pass the grant token returned in the CreateGrant response to users. Instruct users to use that grant token in their call to encrypt.