No former president who has served two terms can run as VP.
Are you sure?
“No former president who has served two terms can run as VP.”
Completely false. No person who has served as President, by election or by succession, for more than 2192 days can be ELECTED to the office of President.
It would have been simple to draft the 22nd Amendment to say what you THINK it says, but that did not happen.
In the instant case, the 22nd Amendment bars the Electoral College from choosing Barack Obama (or Bill Clinton) for service as President. If the Electoral College chooses either of them to serve as Vice President, they are perfectly qualified (constitutionally) to ascend to the office of President, as long as it’s not the doing of the Electoral College.
Read the 22nd Amendment and show me where it says otherwise.