Sign In issues

That is a question for Adobe support, no one here can help you with this. At best scammers would be find you, be warned and don't correspond with anyone who contacts you regarding this. Now with this out of the way, do you have a teams/enterprise account or individual accounts. If it's individual accounts then I think the problem may be bit more serious. In anycase, support is the only one who can say for sure on how to proceed further.

If you have an enterprise/teams subscription then you can contact support via Admin Console

Navigate to Adobe Admin Console > Support

For Personal account, login to your account and navigate to the URL below. Make sure that the browser has cookies enabled, and all script blockers are disabled.
https://helpx.adobe.com/contact.html?rghtup=autoOpen
Type AGENT to avoid bots and talk to a human.

You can also contact Adobe via phone, refer the following link

https://helpx.adobe.com/contact/phone.html

You can reach via Twitter as well @AdobeCare

-Manan