Hi agungs,
Thanks for reaching out using Apple Support Communities. Here to help.
We understand you've been having issues recently regarding Google Meet functionality on your iPad.
Since the issue you're describing is occurring with a Google service and on Google's browsing app, they may have more specific resources to help. Since the error being received is network related you may want to try their suggested network troubleshooting from the article below.
Troubleshoot Meet network, audio, and video issues
It does appear that Safari should be a supported browser for Google Meet video calls. Have you tested the behavior in Safari? You can review the requirements for Google Meet at the link below.
Requirements for using Google Meet
Aside from these suggestions, we would suggest contacting Google support.
Take care for now!