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Invite a Lichess account on Class

I can't add a student to my class. After I add his account and try to click on the invite button, the page refreshes and nothing happens. There are only 25 people in my class and I haven't added all my students yet. Is it possible that this is due to the fact that I tried to add the same account several times?

The console displays the following error:

POST lichess.org/class/*myclass*/student/invite 400 (Bad Request)
same here, i cant invite players even though I've never invited them before or anything
I cannot add a student with their written consent.
We checked together in the settings that it can be requested (path: account/preferences/privacy) and there is a corresponding line
"let Other Players Invite You To Study" - Always

We became friends and sent letters.

But it was not possible to make an invitation yet.
Although it was possible to add another student in March, a
in February (there was definitely no problem)
I have the same issue - we have 23 existing students in my class which were added several weeks/months ago, but I've been trying to add a new student for the past week and nothing happens when I click the Invite button other than a page refresh. Also, the list of pending invitations is now blank - this previously has several old invitations sitting there but these seem to have disappeared. Does anyone know what's going on with this?