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This likely is a connection issue between the players and the server. Have you tried relogging or checking your internet connection to see if this resolves the issue for you?
@Ox6080 Please also contact our support team and give us more detailed info about the device you are using.
@GregorC Thanks for the feedback. It would be great to know what version he/she is using since this issue seems to have special circumstances in which it occurs.
@GanjaKween You could help us by giving us the info we asked for here: https://forum.catanuniverse.com/topic/3131/catan-universe-hotfix-postponed that would be great!