You have created or downloaded a Nearpod lesson, you get to your school to try it and it doesn't seem to be working. This is mostly due to local network issues.
Here are a couple of tips that will help you quickly identify if these connectivity issues are due to security or to network policies at your school.
Verify "Content services'" connectivity
On the network indicator [click here to find out how to open the network indicator] verify if there is a green light next to "Content services". If the light is a color other than green, there is a connectivity issue on the school network preventing you from reaching Nearpod servers.
Content services goes directly to Amazon Cloudfront CDN and does not pass through Nearpod's servers. If there is a problem here, there are two possibilities:
1) Amazon is down (possible but unlikely)
2) Software in the school network prevents Nearpod to reach the Amazon servers
Most often, the answer is option #2. Talk to your School IT Department to verify that they are not blocking any traffic to Amazon's Cloudfront CDN.
Verify that Nearpod works in a network outside your school
On your phone, make sure that you are not connected to the school's WIFI network. Use 4G/LTE on your carrier's network instead. The easiest way to do this is to disable your phone's WIFI. You can disable WIFI by going to iOS settings -> WIFI -> OFF. This will default your phone to your carrier's internet connection.
Open Nearpod and try to join a lesson (e.g. enter the CODE "MAGIC"). If Nearpod works, then the problem is on the school network trying to reach Nearpod servers. Talk to your School IT Department to verify that they are not blocking any traffic.
Verify iOS apps restrictions
Some schools have specific restriction policies to iPads/iPhones apps, assuming the will be used by students only. If the problem is that iPad app does not work, but the webapp [app.nearpod.com] does, there is something blocking iOS apps, and Nearpod is among them. Talk to your School IT department to verify that they are not blocking any traffic.
Teacher vs Student network
Confirm that the teacher's device and the students' devices are connected to the same network.
Sometimes, schools provide a network for teachers and another one for students with different permissions and settings. Therefore the teacher app may work while students won't.
More info on Nearpod and networks on this post: Nearpod and school networks: how to optimize your Nearpod experience