When SMS sent through MessageBird shows the wrong sender or fails in a specific country, check that country's originator rules before your code. The US requires a numeric originator; alphanumeric sender names are not allowed there. Originator handling is per-destination-country, so a setup that works for Denmark can break for the US.

Context: Stack Overflow #38498972 (accepted answer, from a MessageBird employee): A developer was confused because MessageBird's API accepts an originator as the SMS sender, but some countries ignore it. The accepted answer clarifies the rule with a concrete example: sending to the US, you cannot use an alphanumeric originator like a company name; you must use a numeric phone number. A German originator sending to Denmark has no such restriction.