I have Adobe CC but in Light room my Adobe mobile has expired
I have signed out and back in, I have restarted my Mac.
I spoke to the help desk and then I signed out uninstalled Lightroom
Reinstalled lightroom and signed in but Mobile is still expired.
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Moving this discussion to the Photoshop Lightroom forum.
Mobile is one of the things that doesn't work after CC expires, so those links might help reset Lightroom for you.