Every time my friend tries to make a Minecraft account, it says unavailable. She even tried picking names no one would ever think of and nothing works.
Have your friend use this, https://namemc.com/, to find an unused name.
There are no dangerous weapons. There are only dangerous people. R.A. Heinlein
If you aren't part of the solution, then you obviously weren't properly dissolved.
If you have questions about the maps I post as attachments or Amidst and the like read this thread:
Using Amidst type programs to map and research Seeds
The latest release of Amidst, version 4.6 can be found here:
You should probably also read this:
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after too many failed attempts to choose a free name the system locks out and says all names are taken, anti botting i think, give it an hour or so with no attempts and it should fix that