Thanks @jimdunn for sharing your experience with Jami 
I put Jami on 2 of my phones, and could send msgs back and forth. But, as soon as one phone was across town from the other, issues… either no messages received (although they appeared to send; tried from both phones).
The first time I tried Jami, I faced the same challenge. This is actually one of the most frequent challenge with Jami. One way to resolve this challenge is to simply activate this Jami OpenDHT.
Below is the same message as above. But with details if you’re interested in those.
To resolve this challenge, there are actually two options to choose from:
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Option 1: Free OpenDHT
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Option 2: Self-Hosted OpenDHT
For those not familiar with the free Jami community support forum, in the future, when facing a new challenge with Jami, I suggest asking the friendly community for support at https://forum.jami.net They use the same open source forum software as Virtualmin.
I noticed that you already created an account there. You’re pretty quick at finding support. Welcome to the Jami forum.
For those interested in reading or contributing to Jami documentation, it is at https://docs.jami.net