To solve this problem, make sure that you have added the correct DNS records to your domain/hosting provider’s website.Incorrect domain DNS records may mean that the address you entered is not a valid error, because Skype for business cannot contact the server due to the absence or incorrect DNS records.If you also encounter this error, here are a few troubleshooting tips you can use to resolve your login problems with Skype for Business. Several users reported similar issues in the Microsoft community when they signed into Skype for Business on Windows. However, if you try to sign in to Skype for Business, it may happen that the address you entered is not a valid error. Skype for Business provides affordable collaboration tools for your business. Skype for Business is part of the Office 365 package. The tool will then repair your computer.
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Try to remove / update the user SIP certificate.