No angel is ever called Yahweh unless He IS Yahweh.
You are referring to Malek Yahweh which is The Son in the OT
Who is Jesus quoting in Mark 12.26?
Mark 12:26,
But concerning the dead, that they are raised, have you not read in the book of Moses, as God spoke to him at the Bush, saying, "I am the God of Abraham, and the God of Isaac, and the God of Jacob"?
He is quoting Himself, God the Son, as thus…
Exodus 3.1 - 6
And Moses was feeding the flock of his father-in-law Jethro, the priest of Midian. And he led the flock behind the wilderness and came to the mountain of The Gods, to Horeb. And Malek Yahweh appeared to him in a flame of fire from the middle of a thorn bush. And he looked, and behold, the thorn bush was burning with fire, and the thorn bush was not burned up! And Moses said, I will turn aside now and see this great sight, why the thorn bush is not burned up. And Yahweh saw that he turned aside to see, and Elohim called to him from the midst of the thorn bush, and said, Moses! Moses! And he said, Behold me. And He said, Do not come near here. Pull off your sandals from your feet, for the place on which you are standing is holy ground. And He said, I am the God of your fathers, the God of Abraham, the God of Isaac, and the God of Jacob. And Moses hid his face, for he feared to look upon The Gods.
These verses tell us plainly that Moses both saw and spoke with Malek Yahweh (i.e. God the Son) in the midst of the fire.
Observe that the Triune God occupies the Mount (Moses came to the mountain of all The Gods ‘Ha- Elohim’), as the terms Yahweh, Elohim, Malek Yahweh & Ha- Elohim (literally all The Gods!) are used interchangeably.
Who occupied the burning bush?
• Malek Yahweh
• Yahweh
• Elohim
• The Gods (Ha Elohim)
That Malek Yahweh is actually Yahweh, and that Moses spoke to Malek Yahweh, is proven in these verses, as thus…
Deut 4.15 - 19
Therefore you shall carefully watch over your souls, for you have not seen any likeness in the day Yahweh spoke to you in Horeb out of the midst of the fire, that you not deal corruptly, and make for yourselves a graven image, a likeness of any figure, the form of a male or female, the form of any animal in the earth; the form of any winged bird that flies in the heavens; the form of any creeping thing on the ground; the form of any fish in the waters under the earth; and that you not lift up your eyes towards the heavens and shall see the sun, and the heavens, and you be drawn away and worship them, and serve them; which Yahweh Elohim has allotted to all the peoples under all the heavens.
It really should not come as any surprise that Moses saw and spoke to The Son, as the NT also records that Abraham did likewise…
John 8.56 – 58
Your father Abraham leaped for joy that he should see My day, and he saw, and rejoiced.Then the Jews said to Him, You do not yet have fifty years, and have You seen Abraham?Jesus said to them, Truly, truly, I say to you, Before Abraham came to be, I AM!