Dingtalk download: https://www.dingtalk.com/download#/
Choose Linux -> amd64
the downloaded file should be this name: com.alibabainc.dingtalk_7.6.45.5062501_amd64
Install it with this command:
sudo apt install –fix-missing ./com.alibabainc.dingtalk_7.6.45.5062501_amd64.deb -y
To login the desktop app, you have to have the Dingtalk app on your Android/IOS phone. Because you need to scan the QR code from your phone Dingtalk app to login the desktop app.
Dingtalk web: https://oa.dingtalk.com/index.htm#/welcome
Web login: https://login.dingtalk.com/oauth2/challenge.htm?redirect_uri=https%3A%2F%2Foa.dingtalk.com%2Fomp%2Flogin%2Fdingtalk_sso_call_back%3Fcontinue%3Dhttps%253A%252F%252Foa.dingtalk.com%252Findex.htm&response_type=code&client_id=dingoaltcsv4vlgoefhpec&scope=openid+corpid&org_type=management#/login