Buy Shipping problems

I’m having problems with Buy Shipping since the weekend - it was working until Friday but since then every time I try it’s saying no carrier is available.

Is it just me or are other people having problems?

I know that it’s quite possible that it’s not working because of the current restrictions, but as we are in the trial period for Seller Fulfilled Prime it’s not ideal - seller support have just told me to email me a list of the orders it’s not been available for with screenshots, but I don’t think that’s a long term option.