I sent packages yesterday by USPS Priority Small Flat Rate Box without any problem.
Today, I got this--
I should also note that we have an Automation rule that sets Package to Small Flat Rate Box for all Priority shipments, as that is what we use most often. When I open a Waiting Order, the dimensions are seldom preset. That was the case with this order, so first time I got the message, I re-selected Priority Flat Rate and the dimension fields were filled. (Another bug that needs fixing, just not as critical.)
But it still errored out, as you see here.
I tried setting Service to a different carrier and Package to “Package”, then back to USPS/SFRB...no change.
I was not able to solve it, so I repacked it in a USPS Small Mailing Package, changed ShipStation to “Package” and entered its dimensions, and was able to send it, albeit at higher cost.
I need Small Flat Rate Box to work again, ASAP.