Looking for logging into the Imessage 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 Imessage Sign In site. After that you can login as usual with your login credentials.
https://support.apple.com/fr-fr/HT204408
https://support.apple.com/fr-fr/HT204053
https://support.apple.com/en-us/HT203993
https://www.imore.com/how-to-activate-imessage-iphone-ipad
https://www.iphonelife.com/content/how-to-fix-imessage-waiting-activation-error-iphone-4-different-solutions
https://www.youtube.com/watch?v=llqx3zSamC4
https://www.youtube.com/watch?v=oFZcFGYKVOw
https://www.youtube.com/watch?v=v63yUvZJJMo
https://www.youtube.com/watch?v=HT5vpY5PQRs
https://www.imyfone.com/itunes-issues/cant-sign-into-imessage/
https://appletoolbox.com/2018/07/error-occurred-during-activation-for-imessage-or-facetime-on-mac/
https://www.youtube.com/watch?v=rYlTmGdnu38
https://www.youtube.com/watch?v=xUdehTwxFiY