Recently the AuthMe team have updated the plugin to version 5.6.0-SNAPSHOT for MC 1.14.4. I have entered other servers and hosts and the plugin already has it running smoothly.
Server # 1 example:
play.crisecraft.me
You should update the plugin to install it in Aternos. The previous version is still in Aternos 5.6.0-beta1 and corrupts the server, requiring a restart.
There are other servers that already have it running. Apparently the plugin works correctly.
I urge admins and developers to add it asap in aternos, please.
Here I put the direct links of the plugin for you.
https://www.spigotmc.org/resources/authmereloaded.6269/
https://ci.codemc.org/job/AuthMe/job/AuthMeReloaded/
¡Thank you!