Update: I finally received the invitation link.
Reply from the support:
Hi there,
It’s …, again.
We are still investigating this issue, but in the meantime, I would like to see if we can find a workaround, so you will be able to receive the invites. Can you please try following the steps on this link again, but this time on a Microsoft Edge Browser , to see if you will now be able to receive the invites?
Let me know if it works or not.
Regards,