Solving common problems

Most problems with a password manager have a simple cause. Below are the most common ones, with the solution.

Your manager doesn't fill anything in

First, check the address in the address bar. If your manager suddenly stops filling in on a site where it always worked, it may be a fake site. Don't copy your password by hand in that case. Type the address yourself or use your bookmark.
Is the correct address in the item? The manager only fills in when the website address matches the item. If a service has moved to a new address, check this in another way and add the new address. In Proton Pass you can also set per login whether it applies to the whole domain including subdomains (Top-level domain and any subdomain) or to one address only (Exact domain).
Is your vault locked? Open it and try again.
Are your browser and your manager both filling in? Turn off password saving in your browser. In 1Password, go to Settings, General in the extension and turn on Make 1Password the default password manager in this browser.
Extensions don't work in a private window by default. Allow it for each extension in your browser's extension manager.
Safari: in the Safari settings, under Extensions, give the extension permission for every website.

Edge with enhanced security blocks a component that Proton Pass needs. In Edge, go to Settings, Privacy, search, and services, and add pass.proton.me to the exceptions for enhanced security.
Safari in Lockdown Mode does the same. In the Safari settings, under Websites, turn off Lockdown Mode for pass.proton.me.

In the extension, go to Settings, General and turn on Integrate with 1Password app.
In the app, go to Settings, Browser and turn on the connection with the browser. Then fully close the app and the browser and start them again.
On a Mac, 1Password must be allowed to run in the background. Check System Settings, General, Login Items & Extensions.
On Linux, the Snap and Flatpak versions of the browser or of 1Password don't work together. Use the regular installation (see Installing and securing 1Password on all your devices).

iPhone: check in your iPhone settings that AutoFill is turned on and that Proton Pass or 1Password is ticked.
Android with Proton Pass: in the app, go to Profile, turn on Autofill and choose Proton Pass as your autofill service.
Android with 1Password: in the app, go to Settings, Autofill and choose 1Password as the service. If you use Chrome or Brave, also turn on autofill using another service in that browser's settings and restart the browser.

Check that you're logged in with the same account on both devices. With 1Password, also in the same region: 1password.eu.
Check that the device has an internet connection. Close the app and open it again.
Proton Pass: look in the extension menu for the button to sync manually. In the Android app it's called Force sync.

The clock on your computer or phone must be correct. Set the time to automatic.
Check that you're using the code for the right account, and that it hasn't just expired.
If it still doesn't work, use a backup code for that website and set up the code again (see Two-step verification codes (TOTP) in your manager).

1Password says your details are incorrect? Check your email address, your Secret Key and the region. An account on 1password.eu can't be found on 1password.com. The sign-in address is my.1password.eu.
Lost the phone with your authenticator app? With Proton, log in with a recovery code (see Securing Proton Pass: two-step login, extra password and locking). With 1Password, turn off two-step verification on a device where you're still logged in, or set up the codes on a new phone using the 16-character code (see Installing and securing 1Password on all your devices).
Windows Hello still asks for your password after a restart? In 1Password, go to Settings, Security and turn on Use the Trusted Platform Module on your device to unlock. Unlocking with Windows Hello in Proton Pass only works with a paid subscription.
Forgotten your master password? Read Forgot your master password? What you can still do.
Has 1Password suddenly stopped working altogether? Check status.1password.com to see if there's an outage.

Can't get into My WebOké, DirectAdmin or Nextcloud, even with the correct password from your manager? Then take a look at Solving login problems, Can't log in: code, password or throttling or Setting, changing or forgetting your password. If your email program keeps asking for your password after you've changed it, it still has the old password: enter the new one, on your phone too.