Photoshop keeps asking for a subscription, closes upon startup, though I have active subscription

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

if that fails, 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

if those all fail, change your cc language.  eg, try international english

if that fails, change the install location