iCloud tells me it's inactive

From a post by Apple Community Specialist Brittany1416 in thread Inactive Apple ID - Apple Community :

"We'd like to get you some help with this issue. For this issue [an inactive Apple ID], please contact Apple Support for assistance. You may be able to reach Apple Support here: Contact - Official Apple Support "

Telephone numbers --> Contact Apple for support and service - Apple Support

Note that having an "inactive" account is not the same as having a disabled account.

Based on your scerenshot, you need to verify your Apple ID details.

Sign in to your Apple ID account page and edit / update your Apple ID details -> https://appleid.apple.com