During the project handling, we (Premium Plus) will need admin access to your instance.
The credentials are stored in a secure tool called 1password. Here, separate vaults are created limiting access to the information within Premium Plus.
In addition, for the Zendesk accounts, we will install 2FA (2-factor authentification) to ensure maximal security. The account info will be removed at the closure of the project unless an SLA has been agreed upon.