I noticed that if you use a standard user account you are limited. It is better to manage AC from an administrator account especially for updates.
After installing, restarting the required number of times and setting AC leave the Admin account open and log in to the standard account. Then the next day connect directly to the standard account.
I had the same alert as you on the first connection of a standard account but it did not come back the following days.
Above all, you must uninstall AC with Armory Crate Uninstall Tool