I'm the Technical Community Manager for ROR, the Research Organization Registry. Someone who is trying to submit an abstract to Jacow through Indico whose affiliated organization is not in ROR has written us to ask that their organization be added. We're happy to process this request, of course, but our current average review time is 4-6 weeks, and we wouldn't want them to have to wait through that delay before submitting!
We strongly discourage systems from requiring entry of institutions from ROR for this reason -- see our documentation on how to use ROR in forms at https://ror.readme.io/docs/forms#allow-entering-a-text-string-if-no-ror-match-is-found
Does the Indico plugin for Jacow require the entry of an organization from ROR, or is this user mistaken that their organization must be in ROR before they can complete their abstract submission? They shared the following image:

If the plugin does not currently require that an organization be in ROR, I'd recommend removing the above prompt altogether. From the issue at indico/indico#6337 it seems like your developers are aware that the ROR ID should not be required.
Glad to learn more about Indico, though! Seems like a very nice system. ROR is also heavily integrated into InvenioRDM, by the way, so you might confer with them about ROR implementation. Here's a recent blog post about that: https://blog.front-matter.io/posts/simplified-ror-affiliation-metadata-handling/
I'm the Technical Community Manager for ROR, the Research Organization Registry. Someone who is trying to submit an abstract to Jacow through Indico whose affiliated organization is not in ROR has written us to ask that their organization be added. We're happy to process this request, of course, but our current average review time is 4-6 weeks, and we wouldn't want them to have to wait through that delay before submitting!
We strongly discourage systems from requiring entry of institutions from ROR for this reason -- see our documentation on how to use ROR in forms at https://ror.readme.io/docs/forms#allow-entering-a-text-string-if-no-ror-match-is-found
Does the Indico plugin for Jacow require the entry of an organization from ROR, or is this user mistaken that their organization must be in ROR before they can complete their abstract submission? They shared the following image:
If the plugin does not currently require that an organization be in ROR, I'd recommend removing the above prompt altogether. From the issue at indico/indico#6337 it seems like your developers are aware that the ROR ID should not be required.
Glad to learn more about Indico, though! Seems like a very nice system. ROR is also heavily integrated into InvenioRDM, by the way, so you might confer with them about ROR implementation. Here's a recent blog post about that: https://blog.front-matter.io/posts/simplified-ror-affiliation-metadata-handling/