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Same problem. Searched the knowledge base and googled this issue. They only seem to provide answers for Windows users. Very negligent.
You posted to a very old topic from 2017 that's probably un-related to your situation. I branched & moved your question to a new topic for you.
TLS 1.2 connections are required now. Without it, you can't connect to Adobe's servers. You need a modern web browser and a modern operating system -- i.e. Win10 or higher, Mac OS 10.9.1 or higher.
In addition, connection conflicts are sometimes caused by other apps on you
In addition, connection conflicts are sometimes caused by other apps on your system -- Firewall, Anti-virus or OS permission settings. Please refer to the help article below for more details. Solutions are provided for BOTH Win and Mac.
Hope that helps. But if not, feel free to post back with more details about your system and any error messages you are encountering.