Zoom Verification Code

Our company uses Zoom to provide one-on-one tutoring to students.  We create the zoom account and when a verification code is required, it comes to our central email address.

Normally we see requests if a student is at a different location or using a different device to log on with, but for the past week, we have seen an influx of verification code requests with no change in location or device.

Has there been a change within Zoom that is requiring a new code for each log in on certain devices?

Thank you