Might be a license issue then, hopefully Support will sort it out for you.
As for here on the forums, in a last attempt to help, here is what you need to do to be sure to cleanly uninstall everything Sonic Academy's related on your Mac ( supposing you've got only Kick 2 installed. If you're using ANA or ANA 2, you can always re-install them but be sure to back up your USER PRESETS before ).
- Removing SA & KICK 2 files in the main MacOS Library :
Your MAC HDD DRIVE/Library/Application Support/Sonic Academy
That will remove everything ANA, ANA 2 & KICK 2 ( including licenses, presets packs & user presets )
To target Kick 2 delete : Your MAC HDD DRIVE/Library/Application Support/Sonic Academy/Kick 2 folder.
- Removing SA & KICK 2 files in the User Library : ( this one is hidden by default, google it to learn how to make it visible )
/Users/admin/Library/Application Support/Sonic Academy ( entire files )
/Users/admin/Library/Application Support/Sonic Academy/ Kick 2 ( Kick 2 folder only )
- Removing S.A folder in User Preferences :
/Users/admin/Library/Preferences/Sonic Academy folder if you have one in there.
- Removing Installed Plugins :
AU - Your MAC HDD DRIVE/Library/Audio/Plug-Ins/Components remove Kick 2.component
VST - Your MAC HDD DRIVE/Library/Audio/Plug-Ins/VST remove Kick 2.vst ( this path is matching the default installation, if you installed the VST in a different folder, find the kick 2.vst file from there & remove it.
AAX - ( get installed even if not using Pro Tools )
/Library/Application Support/Avid/Audio/Plug-Ins remove the Kick 2.aaxplugin ( same as for VST's if you used a custom folder )
BE SURE that you don't have any older Kick 2 plugins for all AU, VST & AAX format remaining from an older installation.
Again make sure to BACK UP your USER PRESETS, Packs & Licenses. You'll always be able to re-download Presets Packs and Licenses from your user account but not your USER PRESETS !!.
ONCE DONE WITH FILE SUPPRESSION, EMPTY YOUR TRASH AND REBOOT YOUR MAC.
Then re-download the Kick 2 archive from your S.A account to be sure to have a fresh one and avoid any corrupted archive, and perform a new install. Might be worth before doing so to make sure that Live is also up to date and to rescan your plugins.
You should also restart your Mac after installing KICK 2 before even trying to open Live and proceed to authorization.
So once done with the new KICK 2 install, restart, then launch Live, rescan your plugins and only then try to open an instance of KICK 2 and go through authorization.
Live's plugin database can sometime get corrupted, head to Ableton's support if you 'd like to perform a clean uninstall/install for Live too. https://help.ableton.com/hc/en-us/articles/115001172024-Uninstalling-Live-Mac-
That could be some cumbersome steps & process to go through but it's the best way to ensure you're on a clean install for both DAW & plugins.
Maybe this could also help, I'm thinking about MacOS & root files authorization with SIP, you may Google about disabling SIP on Mojave but check this thread, it's El Capitan related but should work.
Last thing I could think about is an issue with your firewall or even your hosts file but that would prevent you to connect & Log into your S.A account if something was preventing that in there. But anyway, might be worth to check out your System Preferences->Security & Privacy-> Firewall settings as well as checking your hosts file by going to :
Finder Menu -> Go -> Select Go To Folder... ( or hit SHIFT + CTRL +G ) and paste in the following path /private/etc in there there's a hosts file that you can check by double clicking on it ( or make a copy on your desktop if you have problem to view the file from this location )
An default Hosts file should look like this one and if your having other entries, make sure that nothing prevents a connection with S.A in there.
hosts (213 Bytes)
So that's a round up of what I think could cause issues unless it's a license problem that only Support will be able to solve. It's worth giving it another try IMO, hope that will help.