Couldn't obtain IP address error

Good evening guys

We are an NPO that provides affordable WiFi to those communities that are not connected and cannot afford a normal monthly subscription.

Can anyone assist me, I have AP’s whereby some users are getting ( Couldn’t obtain IP address error) and if I look under clients on the AP I can see that specific user or rather users have no IP address and some do get IP addresses.

This is a random issue with different service providers
Below is one of the sites experiencing the same issue.
Has anyone else come across this problem?


Could it be this problem perhaps?