Data redaction endpoint does not work at dev environment

Hello,

I tried to delete personal data at the development environment. Given account has been closed for few days, using following request:

curl --request POST 'https://api-d.docusign.net/management/v2/data_redaction/accounts/8d2d3601-24f5-xxx-xxx-d9acac3d26d2/user' --header 'Authorization:AzMzE3In0....' --header 'Content-Type: application/json' --data-raw '{
    "user_id": "91585e2f-xxxx-4a44-bf16-xxxxxxxxxxxxx"
}'

but i get internal error response:

{"error":"internal_server_error","reference_id":"dbb84fb9-3bed-40fd-b708-63112cc15e2b"}

Is this functionality temporarily unavailable? Do I need to fulfill any other prerequisites besides closing account?