If you’re trying to sign in to Skype for Business, but you’re getting an error that says the address is not valid, this guide is for you.
Fix Invalid Address Errors When Signing in to Skype
Update Skype and Windows
Make sure you’re running the latest Skype version on your machine. Click on Notifications to check if you received any alerts about a new version.
Check if there are any updates available for the Windows 10 OS as well. Go to Settings → Update & Security → Windows Update → Check for Updates.
Add the DNS Records
This error could indicate the DNS records of the domain are no there. This prevents Skype from contacting the servers. If you are not an admin, ask the IT admin to add the necessary DNS records.
Keep in mind that it may take anywhere between 24 to 72 hours for the changes to take full effect. This means you may need to wait up to three days to be able to sign in again.
On the other hand, if you’re an admin, you can check out Microsoft’s Support page.
Rollback Office Updates
If you started getting this error after installing the latest Office updates, disable Office updates and then roll back to a previous version.
- To uninstall Windows updates, open the Control Panel.
- Then go to Programs and Features.
- Click on View installed updates in the left-hand pane.
- Select and uninstall the latest Office updates.
- To repair your Office files, relaunch Control Panel.
- Go to Programs and Features.
- Select Office 365/ Microsoft 365.
- Click on the Change button.
- Select Quick Repair. If that did not work, repeat steps 1 to 4 and select Online Repair.
Clear the Lync Cache
Corrupted cache files may prevent you from signing in to Skype for Business.
- Launch a new Run window (press the Windows and R keys).
- Enter %appdata% and hit Enter.
- Go to: AppData → Local → Microsoft → Office → Your Office Version.
- Open the Lync folder.
- Delete the sip_profileName folder.
- Next, launch the Registry Editor.
- Navigate to the following path:
- Remove that registry key.
- Clear your sign-in credentials from the login page.
- Launch Command Prompt as admin and run the run ipconfig /flushdns command. Then try to login again.
Run Disk Cleanup
Speaking of clearing the cache, you may also want to run a Disk Cleanup scan. This will help you to remove temporary files that might be interfering with Skype.
- Go to the Windows Search bar and type ‘disk cleanup.’
- Launch the Disk Cleanup app.
- Select the drive where you installed the OS and Skype.
- Select the files you want to delete.
- Hit the OK button and confirm your choice.
We hope one of these methods solved the problem.