Check the points below to fix the problem of Dashlane are:-

1. General Troubleshooting

Step 1. Restart Dashlane

Close the Dashlane application or browser extension completely and then reopen it.

Step 2. Update Dashlane

Ensure you are using the latest version of Dashlane. Follow the steps mentioned in the previous response to update Dashlane.

Step 3. Check Internet Connection

Ensure you have a stable internet connection. Dashlane requires an internet connection to sync your data across devices.

Step 4. Restart Your Device

Sometimes simply restarting your computer or mobile device can resolve issues.

2. Specific Issues and Solutions

Step 1. Login Issues

Reset Your Master Password: If you're having trouble logging in, make sure you're using the correct master password. If you've forgotten it, you may need to reset it through Dashlane's account recovery options.
Check for Server Status: Visit the [Dashlane Status Page](https://status.dashlane.com) to ensure that there are no ongoing outages or server issues.

Step 2. Sync Issues

Force Sync: Go to the Dashlane settings and manually force a sync. On the desktop app, this can usually be done by clicking file > Sync now.
Re-login: Log out of your Dashlane account and then log back in to refresh the sync process.

Step 3. Browser Extension Issues

Reinstall the Extension: Remove the Dashlane extension from your browser and reinstall it from the official extension store (Chrome Web Store, Firefox Add-ons, etc.).
Disable Other Extensions: Other browser extensions may conflict with Dashlane. Try disabling them to see if the issue is resolved.

Step 4. Autofill Issues

Check Site Settings: Ensure that the site in question is not blocking Dashlane from autofilling information. Sometimes you may need to manually enable autofill for specific sites.
Adjust Autofill Settings: Go to Dashlane settings and ensure that autofill is enabled and properly configured.

Step 5. Advanced Troubleshooting

Clear Cache and Data: On your browser or mobile app clear the cache and any stored data that may be causing conflicts.
Reinstall Dashlane: Uninstall Dashlane from your device and reinstall it. This can often resolve issues related to corrupted files or incomplete installations.
Contact Support: If none of the above steps work contact Dashlane support for more detailed assistance. Provide them with as much information as possible about the issue including any error messages you've received.

3. Additional Resources

Step 1. Dashlane Help Center 

Visit the [Dashlane Help Center](https://support.dashlane.com) for detailed guides and troubleshooting articles.

Step 2. Community Forums 

Participate in the [Dashlane Community Forums](https://support.dashlane.com/hc/en-us/community/topics) to see if others have experienced similar issues and find solutions.