I followed the links to the site, https://movim.eu/, and the link to "Create an account" in the phrase "Create an account and connect to one of our public platforms." links to https://movim.eu/accounts/register, which returns a 404.
I tried clicking on "fr.movim.eu" to create an account on the french platform. By following a few links we finally arrive to : https://fr.movim.eu/?accountnext/movim.eu/, which doesn't work for creating an account.