SharePoint Online 2010??

[Michele Crivellari]

Hi all. This morning i've created a Publishing subsite on a Publishing site collection. The problem is when i try to access the admin panel of this subsite... that's what i see: 

How is that possible? is a SP2010 template!

Does anybody had this issue?

Thanks

Michele

[#2]

Wow, this is really weird for a new site created in a SPO tenant...can you tell us when did you setup your tenant? I recommend you to open a support ticket

[#3]

Well, primary site collection was created in may\july 2017 (don't remeber exactly).

However, after deleting the subsite and recreating it, everything went ok.

Really really strange.

[#4]

SharePoint Online supports older sites. This article may help, https://support.office.com/en-us/article/configure-site-collection-version-and-upgrade-settings-bff9....