The P 12 key is a public key that helps the service account to connect with third-party applications like out software. To create the P 12 key –
Login to your Google Workspace account and go to the list of service accounts.
Choose the service account whose apps data you want to migrate to Office 365.
After choosing the service account, click the Add Key option.
Click Create New key.
Choose the second option of P 12 and click Create.
P 12 key will be downloaded on the computer. You can go and check it in the download folder. You will need to input the whole path of the P 12 key in the G Suite login page of the software.