For Connection Type A, the Advertiser ID is the same as the Account Email. To locate it, log in to app.zeevou.com, go to Listings, and click on Manage Channels in the top right. Select VRBO, then click on Connect. Under Manage Vrbo Connection, in the Property Settings section, you can view the Account Email.
To locate your Advertiser ID for VRBO Mapping Type B, log in to app.zeevou.com, navigate to Listings, and select your desired listing. Click on Manage Channels, then click on the key icon next to Map in front of VRBO. Click on the pen icon. In the window that pops up, you will see the Advertiser ID displayed at the top left under Listing Rooms.