We are struggling with Survey123connect and the Survey123 app adding a comma as the decimal separator to decimal fields when it calculates a value or pulls it through from another field.
My PC regional settings are set to US (originally South Africa, but I changed these in case it made a difference). My separator for decimals and currency is set to a decimal point. Excel is set to use a point as the decimal separator too.
When I type into Survey123 decimal field it allows the decimal point:

When it has calculated the field it uses a comma, and gives an error:

When I have a calculated field using the first example, the calculation does not work and returns a null when I have a decimal point in place. It is expecting a comma. It does not allow me to enter a comma however, as the decimal separator is a point.
It works on the web app, but we need this to work on mobile/offline. Changing all users regional settings to comma is not an option.