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actually I thought these people from Adobe could help you: https://helpx.adobe.com/contact.html?step=CCSN_membership-account-payment_account-settings. Click through 'till you arrive at "chat". If "open" (there are opening hours) please use it, I for my part had the best experiences. I quote from Adobe's employee Preran: The chat button is activated as soon as there is an agent available to help.
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... If it's not working for you, please search for Adobe's staff members, by writing them a personal message. I got to know them as very helpful. They can often help better than we, we the users like you, some of them have real possibilities for intervention. Please have a look in the forum to persons with this icon under their avatar:
To send a private message, click into the picture and use the Message button.
Or you could have a look at Adobe's help e.g.
What do you mean "without sign in"? What happens when you do sign in? Presumably you must have been logged in with a username/email and password when you signed up for the license? That username/email and password is what you need.
When you start Photoshop, there should be a "license this software" option even if the trial period is expired.