App Settings Not working on Garmin Express on a Mac

I've had a user report a problem using Garmin Express on a Mac.  When he tries to change the Sensor Id setting on our Moxy 1st Sensor App, Express pops up a message that the number in the field cannot be greater than 0.  He sent the screen shot below.

He gets the same error for both Datafields and Apps.

When I do the same thing on Express on my PC, it works file.  If I try to enter text, it pops up a message that the data must be a whole number which is correct.

The user has confirmed that he is using Garmin Express version 6.15.0.0 which is the same as I have on my PC.

Both the user and I used a Garmin 735XT as the target device.  The user is in Asia so he may have an APAC device.

I don't have access to a Mac so I have not been able to replicate the problem

Does anyone know how to correct this problem?  Has anyone else seen it?