"We are sorry but we do not support labels to Russia at present"
If you get this error when shipping to Samos, it is because you are shipping to Russia when Shiptheory does not support shipping to Russia with Samos at this time.
For the time being, you will have to manually enter shipments to Russia into the Samos platform.
If this is an issue for you, please contact Support to request Shiptheory adds support for shipping to Russia.