Only webform administrators are allowed to access this page and create new submissions

The message is displayed because "Allow users to post submissions from a dedicated URL" via /admin/structure/webform/manage/{webform}/settings is unchecked.

This is the expected and desired behavior.

@jrockowitz with version 6.2.0-beta5 I cannot see the option you mentioned. Please have a look at the screenshot.

You need to enable 'Allow users to post submissions from a dedicated URL for all webform' via /admin/structure/webform/config

@see ✨ Make it possible to disable 'Allow users to post submissions from a dedicated URL' for all webforms Fixed

I think you forgot to export your webform.settings.yml after updating the webform module.

You might try to run `drush webform-repair` on a dev environment and determine which configuration is out-of-sync.

I enabled Allow users to post submissions from a dedicated URL for all webform in /admin/structure/webform/config.
As a result newly created webform are now correctly displayed to unprivileged users, though webforms who were already there are displayed just with a title and submit button, no body.

I never knew I had to export webform.settings.yml after updating the webform module. How am I supposed to operate to accomplish this?

I did try a "drush webform-repair" on a dev environment, but it didn't help.

Perhaps the only chance I have is re-creating pre-existing forms from scratch?

Thanks!

@see https://www.jrockowitz.com/blog/managing-webform-configuration

I humbly read the article, I got the suspect some of the already built webforms have a configuration non fully compatible with a Webform version newer than the one used to build them - is that correct? - but still I can hardly tell what the way out for me could be, if I exclude the time consuming creation of the webforms from scratch. The "Repair configuration" process didn't help. Would you please possibly supply me a step by step guide for my case? Thanks in advance!

You could make a new, working Webform and compare its dumped configuration to that of a broken one.