Why does Acrobat not stay signed in?

I use Adobe Send and Track in Outlook to send a link for the recipient of an email message to download a file that is too big for most email systems.   When I choose Adobe Send and Track then click the file I want to send, I get a message that I need to sign in to Adobe.   Even when I have already signed in, it still gives this error message.
DoctorK12008Asked:
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Jackie ManIT ManagerCommented:
Have you subscribed for Adobe Acrobat Cloud?

Adobe Send and Track is not a free service.
DoctorK12008Author Commented:
Do you mean "Adobe Document Cloud"?   There are so many Adobe programs.   I have Adobe Acrobat DC.   Not sure if this includes Adobe Document Cloud.   Adobe Send And Track has worked in the past with my current configuration.
Jackie ManIT ManagerCommented:
It is not about your configuration.

The adobe account you have signed in does not have a valid subscription for using the service.

Have you paid US$19.9 annual subscription fee to Adobe to use the service?
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DoctorK12008Author Commented:
Not that I recall.   I will do this and see if it makes any difference.
Jackie ManIT ManagerCommented:
My figure for the subscription fee was outdated. Current one is in the link below.

https://acrobat.adobe.com/us/en/acrobat/pricing.html

Click the link below and it will tell you how to check the plan you have subscribed.

https://helpx.adobe.com/creative-cloud/help/manage-cc-individual-membership.html

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DoctorK12008Author Commented:
Thank you.   I checked my subscription and downloaded the latest version of Acrobat DC.   Now it works.
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