When the tests time out, this is usually an issue with Glitch. Your app link passes for me, now. So, try again a few times. Or, Either:
There is an error in your code, in which case you will be able to see an error in the Glitch logs.
Your app is not being served properly, and freeCodeCamp cannot access it for testing. This is more difficult to debug.
A usually stable option to solve this is to follow the link in the README.md file of the project, and create a new project in Repl.it, and copy-pasta your code from Glitch to there.