maybe the solution to my problem is quite simple but I can not find a way on the taxonomy term page to show a menu block!
I use drupal 8 with bartik theme and have a menu based on taxonomic terms (Module: Taxonomy Menu + Menu Block). This menu is also always displayed everywhere (with the set content types). Just not on the taxonomy term page (the page where all entries are displayed from a taxonomy item in a teaser view).
if I look under Structure> Block Layout> Navigation> Configuration: is there "page" there I tried to enter URL of the taxonomy terms or also / * but both remains without effect.