Why can't I use acrobat on my ipad ? It tell me that you no longer have access to this service

Did you clicked on the link provided below that message?

I understand iPad uses Adobe Acrobat Reader mobile app, but in order to unlock some of the premium editing features you Adobe Acrobat Pro DC subscription must be current.

Check online, go to adobe.com and  login with your AdobeID; review your user account setting and see if it is necessary to manage your plan or if your Adobe Acrobat subscription is activated amd shared in more than one computer device.