delete https://your-tenant-name.tenant.userclouds.com/userstore/config/purposes//softdeletedretentiondurations/
This endpoint deletes a specific SoftDeleted ColumnRetentionDuration for a tenant purpose. SoftDeleted data is data that has been deleted but is retained for a specified purpose and duration after deletion. Once the purpose default retention duration has been deleted, it will fall back to the tenant retention duration.