Snapchat isn't a phone or in-person voice conversation. State two-party recording consent rules don't apply.
If you work for a large employer in the United States, they are probably decrypting all of your TLS traffic to every site on the internet from your (their) work devices without the consent of the other party. This is a part of any good security architecture. There is no other way to ensure it isn't actually malware command and control traffic, for example.
You consent to this by using the employer-provided device and only your consent is needed. Same deal here. I am sure Snapchat doesn't like it (I think some of Meta's internal messaging around it said as much) but I can't think of how it would be illegal in the U.S., though I can't speak for every jurisdiction in the world. Not a lawyer, though.