Dave, please forward your request to the Support Team: http://support-portal.plarium.com/ticketcreator/throne/en?devicelocale=en&spGame=throne-web
They will check the issue🙏
> Has the Teacher Rune been disontinued ? I do not see it in the storeroom anymore
I still see them, e.g. Devotee and Adviser.
I have had same happen, with gems too, when I use them all up. (Pretty rare, you have to have exactly the right number for a whole number of legendary, then apply them to gear.)
If you go into rune workshop, you can use the drop down to deselect all and select training - you won't see anything listed if you don't have any.
[They must still be present, or you wouldn't see the training 'category' in the drop down list.]