the annotations which I created in Illustrate are not visible in the TWX experience on HoloLens.
Are you able to see them on a mobile project?
Check out this Knowledge Article on how to display annotations: https://www.ptc.com/en/support/article?n=CS251810
There is also this tech tips post on showing sequence step names: https://community.ptc.com/t5/IoT-AR-Tech-Tips/Display-sequence-step-names-from-Creo-Illustrate/m-p/5...
unfortunately, both links are not working.
Generally, I know how to use Creo Illustrate. The annotations are visible in the sequence preview.
And yes, the annotations are visible in a mobile project.
Creo Illustrate annotation will not appear in HoloLens Experiences. Perhaps you could try the 3D Labelling widget to provide some form of text annotations?