I say yes.
The state of the earth during the millennium will not allow it.
All of the tribes of the earth would NOT MOURN, if they thought that they would have a second chance during the millennium.
I don't quite understand. At all times, even during the millennium, people have the opportunity to follow God.
But not for everyone.
Peaceful Sabbath.
Yes. Correct. As free-will spirit being, we all have the capacity not to receive.
Matt 13: 57 And they took offense at him. But Jesus said to them, “A prophet is not without honor except in his hometown and in his own household.” 58 And he did not do many mighty works there, because of their unbelief.
God wanted to do miracles, had the power to do miracles but people chose not to receive.