Thank you @marta and @prosper.
So, considering that we can connect to a 2.29 instance that uses a http connection but cannot connect to a 2.30 instance which uses a https connection, do you know if anybody else has experienced this kind of issue and how did resolved it?
We tried with the HISP TZ DHIS Touch and also could not connect. I reached out to @John_Francis_Mukulu who said there might be an issue with our certificate that is not allowing the connections on mobile but would not show up on the browser.
We are scouring the logs to see if we can find anything to give us a clue as to what is happening.
Thank you