Hello,
I am still running ISLE7 while I finish my migration to newer ISLE for Islandora 2, but I have not run into this issue yet. I assume you are running an existing ISLE7 site or is this a brand new ISLE 7 site? I ask because ISLE7 is end of life.
Also, another member of the community larted me of this related issue...
https://github.com/portainer/portainer/issues/4305
where they say...
"In Portainer 2.0 and onward we will not be providing a no-auth flag any longer, so you either need to remain on 1.24.x, or adapt your use case to accommodate our long-life authentication token."
Sounds like a workaround is needed or we can try running an even older version of Portainer?
I am not the best person to respond to this, but I wanted to offer a bit of additional info.
Good luck,
Yamil