A. 1. Use Email or Phone: If you are trying to sign in with a method that is not working, try using an alternative method such as email or phone number.
2. Check for Updates: Ensure that you are using the latest version of DingTalk, as updates may introduce new sign-in options.
3. Clear App Cache: Go to Settings > General > iPhone Storage > DingTalk, and offload the app to clear its cache, then try signing in again.
B. 4. Use a VPN: If you are in a region where certain sign-in options are restricted, consider using a VPN to access the app.