Looking for logging into the Lumia Sign In site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Lumia Sign In site. After that you can login as usual with your login credentials.
https://www.microsoft.com/en-hk/account
http://support.three.co.uk/SRVS/CGI-BIN/WEBISAPI.DLL/,/?New,Kb=Mobile,Ts=Mobile,T=Device,varset_pid=7759,varset_cid=7763,Case=EXT(EM6806)
http://support.three.co.uk/SRVS/CGI-BIN/WEBISAPI.DLL/,/?New,Kb=Mobile,Ts=Mobile,T=Device,varset_pid=14991,varset_cid=14993,Case=EXT(EM46040)
https://www.att.com/devicehowto/tutorial.html#!/interactive/id/interactive_1500007473?make=Nokia&model=Lumia1520
https://forums.windowscentral.com/nokia-lumia-720/232458-cant-sign-into-my-live-account-error-0x80048264.html
https://deviceguides.vodafone.ie/nokia/lumia-625/basic-use/activate-microsoft-account-on-phone/
https://www.helpforsmartphone.com/public/en/microsoft/lumia-535/windows-phone-8-1/guides/8/Set-up-Gmail-Microsoft-Lumia-535
https://support.office.com/en-us/article/troubleshoot-onedrive-for-windows-phone-app-problems-1ca67590-7ee0-460d-993d-ee4260608192
https://www.verizonwireless.com/support/knowledge-base-79464/
https://windowsphone.stackexchange.com/questions/15160/cant-log-in-to-skype-lately
https://btbusiness.custhelp.com/app/answers/detail/a_id/27521/~/how-to-amend-or-delete-an-existing-email-account-on-your-nokia-lumia
https://developers.facebook.com/docs/facebook-login/windows-phone/
https://www.ucl.ac.uk/isd/how-to/install-and-log-to-skype-for-business-for-windows-phone