FindInstance::naqs Reduce::naqs

Details

This message is generated when some of the elements in the first argument of the indicated function are not equations or inequalities.
Off[message] switches off the message; On[message] switches it on. For example: Off[FindInstance::naqs].

An error message is generated because x^2+y^2 in the first argument is not an equation:

This shows valid arguments in Reduce:

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