I am having the issue where my Lightroom Mobile app and the sync to mobile portion of the desktop app say that my account is expired, but the Adobe website and the desktop app show my account is current.
I am on the CC Photography Plan.
A little bit of background:
I originally purchased this plan through Amazon, but due to a billing issue they couldn't resolve, they cancelled my subscription and refunded my money. Same day after they did that, I went to Adobe's website and activated a new CC Photography plan under the same Adobe ID.
Please DM your Adobe_id so that we can look up the account and check.
Also, sign out of Lightroom mobile app and sign back in, ensure you are using the latest version.