Hangouts Meet Gateway may not work due to Google Cloud is experiencing issues
Incident Report for Pexip Service
Google Cloud has resolved their incident and no further issues have been observed or reported and all systems are operational at this time.
Posted Jun 03, 2019 - 00:09 UTC
Google Cloud is currently experiencing service issues in multiple theatres.

Google has posted about this issue here:

We are continuing to monitor this issue and will verify our Hangouts Meet Gateway Service is operating normally once Google Cloud has resolved their issues.
Posted Jun 02, 2019 - 19:25 UTC