Google warns of "suspicious activity a login from a geographic location that is different from your normal location is attempted.

We connect to your Google account from IPs based in the United States. More specifically, we have IPs in New York and Texas.

As such, if you're not from New York or Texas you might see this notice in your Google account after linking us with your Google Play developer account.

To prevent this from happening, use the following link to instruct Google to allow access to the account, and then link your account:

http://accounts.google.com/DisplayUnlockCaptcha

After updating in Google you should go back into Linked Accounts to run through verification with Google again, by re-importing your Google Play credentials.

Once the account is linked successfully it will continue syncing automatically every day without the need to allow access manually.