You may see multiple popups in Canary requesting keychain access when switching between different app versions. For example, when you switch from our beta version to the App Store version, or from the App Store version to the SetApp version.
Now all you have to do is just enter the password which you enter while you login on your Mac and press the ‘Always Allow’ option when the pop-ups occur.
Note that you may see multiple popups per account, so it may be a good idea to copy / paste your password.