My plan showed Adobe Express as an included app

Nrjsuthar, thanks for your question. Please see https://www.adobe.com/creativecloud/photography/compare-plans.html for information about what is included in your recently purchased Creative Cloud Photography plan. 

If you have additional questions or comments about accessing Adobe Express, then I would recommend posting to the Adobe Express forum at https://community.adobe.com/t5/adobe-express/ct-p/ct-adobe-express?page=1&sort=latest_replies&lang=all&tabid=all

edit: ignore @Peru Bob and my suggestions. you have a plan that does not include adobe express.

if the above preceding suggestion fails to help, proceed to these steps - https://helpx.adobe.com/enterprise/kb/resolve-trial-and-license-expired-errors.html

if that fails, https://helpx.adobe.com/download-install/kb/adobe-license-issues-keychain-credential-mgr.html

below are solutions some users reported:

if those all fail, change your cc language. eg, try international english - https://helpx.adobe.com/creative-cloud/kb/creative-cloud-trial-mode.html

if that fails, change the install location

See here:

https://helpx.adobe.com/manage-account/kb/stop-creative-cloud-trial-mode-after-purchase.html