Layer Type option is Imagery not available

[TLeed]

We set up an image server on our ArcGIS Enterprise and we aren't able to see Layer type 'Imagery' from 'Share as Web Layer' .  We are still able to publish as a map image and we can go to the Web interface and add imagery through 'New Item',  but can't do so through ArcGIS Pro. 

[ChristopherCounsell]

Are you sharing from the Catalog?

Web imagery layers are shared from the Catalog pane, not the Contents pane nor the Share tab on the main ribbon.

https://pro.arcgis.com/en/pro-app/latest/help/sharing/overview/web-image-layer.htm