Comment
I am sorry, for giving such a broad and unclear Issue. I assume there are not enough technical details to help you fixing it directly. But the described behavior do affect my translators often. So I report it like user story.
This is not about the registration process. This is hard enough for some of my translators. But even when they registered at https://codeberg.org and logged in at https://codeberg.org, Weblate itself doesn't recognize that active login.
Because of that the translators telling me that they registered and logged in but they can not find the buttons etc ("Approved" checkbox, "Not sufficient privileges to save translations", ...). Keep in mind that translators often none-technical person.
It might be the case that add-blockers or cookie-blockers might be involved in this Issue. But this is not for sure.
Thanks a lot for working on Weblate at all. Weblate at Codeberg is IMHO currently the only acceptable translation solution for FOSS projects without money. There is much value in it. And I hope you keep that service up and running no matter that its maintenance is far away from being easy.