Hi Wolfgang,
Please allow me to assist you with this.
For this issue I think it would be good to take a look at the logs, so this issue can be correctly evaluated. So I'd like to ask you to open an ticket through https://www.atlassian.com for Confluence Cloud, in english. With this they'll be able to assist you more.
Wolfgang, I hope this will help you.
Kind regards,
Manuela Kurtz
Atlassian Support
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