Raphael -- I dont immediately know what the problem would be. Are you using this with a consumer Google account, or a G Suite / Workspace account (through a company or school)? When i ran through this the first time, that prompt will show, but you should be able to click through to accept/authorize it anyway....unless your Organization admin has set rules around things like this maybe? if it's a free/consumer acct though, i can't imagine what the issue would be.