Failing assertion, can't understand why or how to fix it?!

I thought about that, but to be honest I really don't feel that's the appropriate answer.

In our business validating exact information is pretty crucial and I think using a contains would allow for additional information to technically pass. This information is likely to not change, but I cannot say with 100% certainty that it will never change. I would really like to understand why this is failing so that I, or someone, can correct this issue.