When connecting an Office 365 account to the warm-up process, you might need your workspace admin’s approval to connect to other apps. The “Approval required” error may occur when you attempt to get authenticated with Office 365 credentials in the OAuth window:
This is a guide for your admin to consent to your account’s connection:
Navigate to https://entra.microsoft.com and log in as a Global Administrator.
Within the Admin Center, head to "Identity" -> "Applications" -> "Enterprise Applications."
Click on "Security" section > Consent and permissions, and select "Allow user consent for apps."
Enable "Users can request admin consent to apps they are unable to consent to." This empowers users to seek access, streamlining the review process.
Add users and click on "Save."
Go to "Admin Consent Settings."
Click on “All (Preview)” to see the list of requests. After clicking on the request, you’ll see its details and see if they were reviewed or not.
Click on the “Review permissions and consent” option at the top.
Log in to the admin’s account and accept the request.
After that, go back to Woodpecker and click the button to add a warm-up for this mailbox again. When a window pops up, you should be able to just choose the account from the Microsoft panel without any extra steps.