IBE still works. What does it mean in your case "no longer working"? Do you use Chrome? Better use Firefox right now.
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Adress should only be "daliaquartet.com"?
If that doesn`t help, are you allowed to set up a new usename and pw?
This issue is been faced by few more users and the IBE team is investigating on this with the collaboration of Muse engineering team.
I suggest you open up a ticket with them directly here - https://feedback.inbrowserediting.com/#contact-us and wait for their response.
Please provide the further details which they might require from you.