"Delivery SLA is not available for destination address." is an error that Amazon may return to Listing Mirror for MCF orders. What this means is that Amazon is not able to accept an order to the specified address at the specified speed.
Some common reasons we may get this response include the shipping address being a PO Box, in Puerto Rico, or a country outside Amazon's fulfilment.
Unfortunately, Amazon cannot be forced to accept the order, so if you're unable to fulfill it another way the order may need to be canceled.
If you're having more trouble with this, please contact us.