And delete any entries you see on the right section of the Registry Editor window.HKEY_CURRENT_USER\Software\Microsoft\office\16.0\Lync.The directories there can be expanded by pressing the + icon next to it). Once the Registry Editor window is opened navigate to this key (For navigation, use the left pane.
#Cannot log into skype for business in office 365 windows
![cannot log into skype for business in office 365 cannot log into skype for business in office 365](https://www.american.edu/oit/office365/images/SkypeforBusiness.png)
![cannot log into skype for business in office 365 cannot log into skype for business in office 365](https://invorx.com/wp-content/uploads/2019/01/Skype-for-Business-1.png)
![cannot log into skype for business in office 365 cannot log into skype for business in office 365](https://angelcom.com/wp-content/uploads/2015/12/Cant-sign-in-to-Lync-There-was-a-problem-acquiring-a-personal-certificate-required-to-sign-in.jpg)
This error appears due to many reasons, one of which is junk in your Skype’s cache. One of these is the ‘ There was a problem acquiring a personal certificate’ error which appears when you are trying to log in to your Skype Business Account. In some cases, logging in to Skype becomes an ordeal because of numerous errors that pop up while doing so. Skype was introduced back in 2003 and it has been through a lot of changes through these years and newer features have been introduced along the way. Skype, developed by Microsoft, is a telecommunication application that provides audio, video calls to its users along with a chatting interface.