Check these details and Skype Notification Login Page information here. If you are a first time user you will need to register your account or create a new one, otherwise you can login on Skype Notification Page with your previous login details. These results are more helpful for you as these are anti checked and also verified by the system. You just need to open the Login page links nd enter your Login details like Login Id and Password and submit the information. If you face any issue in your Skype Notification page Login, you can contact us from our Contact Us Page.
https://support.office.com/en-us/article/tell-me-when-someone-s-status-changes-042a13d8-c815-4101-8b41-1e141b6bf6e9
https://ccm.net/faq/11490-skype-disable-notification-when-a-contact-comes-online
https://www.skypefeedback.com/forums/299913-generally-available/suggestions/17783632-the-ability-to-turn-off-the-online-notification
https://www.auslogics.com/en/articles/skype-erupts-annoying-notifications/
https://smallbusiness.chron.com/rid-skype-popups-68939.html
https://superuser.com/questions/562712/how-can-i-turn-off-skype-notifications-to-others-when-i-go-online
https://perlmaven.com/how-to-get-notification-when-specific-contacts-go-online-using-skype