Companion bug or issue

I was created a project and testing with companion but today a new bug happen then i created a new project and retest it same problem happened .

And also clear data and reset my connection but same problem . And it was worked successfully on my same network yesterday but today i got this error.

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what? i am trying to search

That error will appear when your device has no internet connection.
Try disconnecting and reconnecting the device and then tell me how it went !!