Thanks @jthomas. I tried to connect and got this error:
There is a problem with the server certificates. Please, contact your administrator
Do you get the same error? If so, it means that the SSL configuration in the server side is missing an intermediate certificate. This issue can’t be noticed when accessing through a browser, but the Android app complaints about it and can’t connect. Check this post about this same issue, it can be usually solved by just adding the intermediate certificate in apache or nginx (error:java.security.cert.CertPathValidatorException: Trust anchor for certification path not found on tracker capture app dhis2).
Please let me know if you still can’t connect or if the error you get is different.