Why am I unable to sign into Google?

Using a Q8H_HD tablet, I cannot set up an account on it in settings, nor access any google app - always the same "Cannot connect" error message.
Via my PC or via a browser I can access my Google account, but with a "No device " error when using the tablet.
I have tried every fix on the web from reset, to cache clear, to time verification, to a new Google account. Everything results in the same error. So apps don't run properly and I cannot sync, locate update or install. Any ideas?

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