Several users have reported similar issues in the Microsoft community when signing in to Skype for Business in Windows. If you are also troubled by this error, here are a couple of troubleshooting tips to help you fix Skype for Business sign-in issues.
How do I fix the address you typed is not valid Skype for Business error?
1. Check the DNS records of the domain
Adding DNS records for the domain
2. Check for pending updates
3. Remove Lync cache
Clean the registry entry
Delete Skype Sign-in information
4. Reinstall Skype for Business
The Skype for Business error can be resolved by updating the DNS record, clearing Lync cache, or by deleting some registry entries. Follow the steps in this article and let us know which method helped you resolve the issue in the comments.
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