Sandbox Mode seems to hate me. Now I get this."Explanation"

[wanton tendon]

Also I deinstalled and reinstalled it though because I thought it would be the same as last time but nothing

[dusky terrace]

Having same issue on my xbox via cloud gaming. Believe they are aware of the issue and looking into repairs.

[alpine kelp]

There are some problems with connecting to mod.io - we are working on it!

[astral meteor]

Is there any other news on this?

[slender moth]

I had this issue and I just uninstalled and reinstalled the game, it then worked for me