When trying to connect via crossplay to a world on the same network there an error but people can connect to the server from a different network.
Devices used:
Window 10 - Running Minecraft 1.14.30 - Server Host
Switch - Running Minecraft 1.14.20 - Connecting User
Related issues
Comments

Thank you for your report!
We're actually already tracking this issue in MCPE-36190, so I've resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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