If you subscription is up to date can you let us know your license type? Is it a normal Photography Plan License? Educational? Corporate (Enterprise)? There have been reported instances with a Corporate license where the issue turned out to be the Corporate Admin controls.
If you have a team/corporate license contact your Administrator to ensure these functions are not being blocked.
I have a corporate license. Is there a way to check in Creative Cloud if the issue is with corporate admin controls? I am not using an enterprise platform. It is a subscription we bought with a corporate card that gets reimbursed.
This is a user to user community. For some issues it will be necessary to contact Adobe directly. Click the following link and scroll down the page to Individual or Business. Then click “Sign in to contact us” It should be possible to start an on-line chat with Adobe Support. They should be able to check your subscription and the reason why you can't add photos. https://helpx.adobe.com/support.html