I have been playing only on my second console for a few months now as when I go to my home console (on the same wifi network) it repeatedly tells me 'your save has taken too long to sync to the cloud' or 'your other console is not syncing to the cloud) I have both consoles next to each other both plugged into the same router/modem via ether net cable and all other games have no issue.
Spoken to @xboxsupport on twitter who cannot find a fix and suggest it is an issue at your end?
Made copies of my world's and deleted the older versions which at least started bringing up the 'too long to sync screen' before that I only had 'this console nov 30th' or 'no save data found online'.
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Auldrick
[Mojang] Mega_Spud (Jay)
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-26064.
Your additional information and observations are very useful, so if you can add them to the comments section of the parent issue it would be appreciated.
If you have not, you might like to make use of the search feature before making a new ticket, as it's likely that the issue has been reported already.
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migrated
Have you thought about the possibility that your router is using different settings for one of the consoles? I don't know what your router is capable of, but many modern ones have firewall settings that can be specified per device. It may not be allowing the console to access the internet, or may not allow access via a required port number. If you don't have access to the router's administration interface, you will need to get help from someone who does to check this.