Thanks for reaching out. We are sorry about the trouble with Lightroom. We are here to help!
Could you please confirm the version of Lightroom from Help > About Lightroom along with the version of the operating system on your computer? Have you tried to sign out and sign in again in the application?
Upon checking, we could not locate any subscription on the provided email. Could you please check the email account used in your mobile app store and sign in with that email account in Lightroom Mobile? Please check here for more steps:
Suppose you have made the payment on your respective mobile stores like Apple store & Google Play Store etc. You will only have access to the Lightroom Mobile.
Please check here to understand more:
Please let us know if this helps.