The NIH does not issue or revoke licenses - that is the purview of State licensing boards. But as Saanvi is apparently a researcher, even if her state license to practice medicine was revoked, that doesn't affect her ability to conduct basic science research.
When Saanvi goes to the travel agency that Vance has asked her to contact in case of emergency, there is long lock on the shutter of that place, but she keeps on calling to open, and keeps on knocking (rattling) the door, then she notices that there is a lock. There is no way she could have "not" noticed the lock.
Vance character is suffering from script-writer's confusion. Initially, Vance was the top most person against the plane returnees. Then he had a change of heart and started supporting plane returnees even going against his own seniors and government. He even staged his own fake death, that is so unbelievable. Then he disappeared for major part of this season, doing nothing sort of. There was no input from Vance that would have helped plane returnees. And now she is doing nothing useful at all and is intimidating Saanvi and appears to have lost interest in plane returnees and mentally given up the cause.