If the problem persists, reinstall the app. To sum up, if the “Failed to Fetch” error prevents you from logging in to Bitwarden, temporarily disable your firewall and check if the issue is gone. If your login problem is caused by invalid certificate issues, installing a fresh copy of Bitwarden should fix it.
Of course, make sure Bitwarden is the only password manager running on your device. Disable all your extensions, restart your browser and check the results. The other extensions installed on your browser might be breaking Bitwarden’s login script. If you use Chrome, use this step-by-step guide to clear the cache. Go to your browser’s History section, select the Clear browsing data option and clear the cache. This could cause a long list of glitches, including login issues and the “Failed to fetch” error. Your browser cache and cookies might be interfering with Bitwarden. Fix Bitwarden “Failed to Fetch” Error in Browser Clear the Cache Download the app from the official website instead of downloading it from the App Store or Microsoft Store. Then download the app again, reinstall it and check if it works as intended. If the problem persists, uninstall Bitwarden and restart your machine. If this method worked, make sure to whitelist Bitwarden in your firewall settings. You can re-enable your firewall protection after logging in.
Temporarily disable your firewall and check if you can log in to your Bitwarden account. If you’re on Windows, launch Command Prompt with administrative rights and run the following commands: If you’re using a self-hosted instance on Mac, launch Terminal and run these two commands: Running outdated app versions on the latest OS releases may trigger all sorts of issues, including login problems. Fix Bitwarden “Failed to Fetch” Error on Desktop Update the App
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