Messages/iChat Not working after upgrading to High Sierra (Jabber)

Messages/Google Chat Not working:

If you want to continue to use Google Talk via Messages, you'll need to re-enable the "less secure" authentication mechanism in your Google account.

• Go to https://www.google.com/settings/security/lesssecureapps
• Select "Turn on"
• Cringe a little bit
• Log into Google Talk via Messages
• https://deciphertools.com/blog/2015_02_11_google_talk_not_working_messages/

https://www.imore.com/google-chats-not-working-messages-mac-high-sierra-heres-fix

https://forums.macrumors.com/threads/gtalk-messages-solution-found-high-sierra.2073393/

Go to system settings and go to Internet Accounts and delete your google account.

Open Terminal

find ~/Library/Preferences -name "*iChat*" -delete

then

rm -rf ~/Library/Caches/com.apple.Messages

then

rm -rf ~/Library/Messages

and reboot

Now open Messages and add your google account via Jabber. Then go to preferences in Messages and go to Accounts and go to server settings and make sure settings are as follows:

Server: talk.google.com

Port: 5223

Check Use SSL

Then go to Account Information and Enable this account

I rebooted again and then opened Messages and made sure my buddy list was there.

Then I went to System Preferences and go to Internet Accounts and add your google account.

Upon doing this a message popped up for me asking to Add Google Talk to Messages and WHOA it is working.

I can now send and receive messages, have my calendar and everything as before.

Before this I could receive messages and see buddies but couldn't communicate with them.

Locked Office/IP Phone

If a locked icon is showing on an office phone or IP phone...

1.  hold down the star button (*) for 5 seconds until the screen changes. 
2. When prompted for a passcode, do not put anything in.
3.  Just hit the ok button (menu button). 
4. The phone should unlock. 

• If it does not unlock, when it asks for a password, enter: 123 then hit ok.

***one of these instructions locks the phone and the other unlocks the phone.

DRC App Deployment

Before deploying DRC configurations to Org Units ensure that the DRC app has been pushed out to all Chromebooks.

Device Management > Chrome Management > Device Settings > Kiosk Settings

** If the app is removed and needs to be added again, the ID and URL can be found in Downloads on the DRC Portal. App is added through Custom Apps.

CREATING CONFIGURATION FILES

DRC Portal > Select TSM > Deployment > Deployment Configuration Files > Create Deployment Configuration > Save

ASSIGNING APP TO ORG UNITS 

Device Management > App Management > DRC App Settings > Select Org Unit > Configure (override) > Upload Chromeos.json