Found the answer with some help through support staff. The problem was
my package was outside of the parameters for Ground Advantage as it was
too large. The support person provided me a link to those parameters,
which were in the ShipStation knowled...
I had the same issue, and I had to choose different, more expensive
shipping options (e.g. changing from UPS Ground Advantage to UPS
Ground), which in a split order was a difference of over $3. I was asked
by the support person to reach out in the co...