Unexpected Upgrade SDK warning

[Tim13]

We use the Meetings SDK, a few months ago we upgraded from v2 to v3.8 but today we got an email saying "we have identified that your application is running a version of the SDK that will be retired"

This comes as a surprise as we use 3.8 of the web sdk, and never used 2.17 at all (so it wouldnt have been working for months if that was the case).

Is zoom mis-identifying what accounts are using old SDKs, am I taking crazy pills, is there any way to get more information about what and when the old SDK was used?

Thanks,

Tim