S21+ message on restart

[S21Question]

Hi. I receive the following message when I restart the phone. Does anyone know why please ? And how to stop it ? Many thanks. 

[Robot-]

I havent seen this before, what happens when you click "ok"?

Have you contacted Support?

[pete007]

Is your phone locked to your registered email ??

[BaronDigo]

Did you root and or unrooted the device?

[S21Question]

Nothing, my phone seems to work as normal. 

[S21Question]

Not that I know of, no.

[S21Question]

No, sadly I'm not that technical. 

[pete007]

Can you do a full hard reset??