Whenever selecting a tool/weapon proficiency for Astral Trance, I noticed the lyre is not available while the rest of the PHB instruments are on the drop down list.

Is your character already proficient with that instrument?

The character has no proficiency with the lyre, just the herbalism kit from the druid class

And here is the screenshot of the astral elf's drop down list for Astral Trance, the lyre should be directly beneath the lute, but is not present

Hunh. Good catch. When they were designating which tools were on the “weapon/tool from PHB” list, they musta skipped the at one.