In case someone is facing this problem recently, now that there is only the 'allow' button, this is what worked for me:
After doing what other threads suggested (Reset My Default Keychain) what worked for me is that the password was literally nothing. When the default keychain is resetted, by default it does not have a password.
So if you just click on the continue/allow button without writing anything in the password field it will just work.
albaschez
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